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''Based on a lesson by Ludovic Tournès''<ref>[https://www.unige.ch/lettres/istge/unites/hco/enseignants-chercheurs/tournes/ Page personnelle de Ludovic Tournès sur le site de l'Université de Genève]</ref><ref>[https://www.cairn.info/publications-de-Tourn%C3%A8s-Ludovic--5840.htm Publications de Ludovic Tournès | Cairn.info]</ref><ref>[http://sirice.eu/membre/ludovic-tournes CV de Ludovic Tournès sur le site de l'Université de la Sorbonne]</ref>
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| cours = [[Introduction to the history of international relations]]
| faculté = [[Lettres]]
| département = [[Département d’histoire générale]]
| professeurs = [[Ludovic Tournès]]<ref>[https://www.unige.ch/lettres/istge/unites/hco/enseignants-chercheurs/tournes/ Page personnelle de Ludovic Tournès sur le site de l'Université de Genève]</ref><ref>[https://www.cairn.info/publications-de-Tourn%C3%A8s-Ludovic--5840.htm Publications de Ludovic Tournès | Cairn.info]</ref><ref>[http://sirice.eu/membre/ludovic-tournes CV de Ludovic Tournès sur le site de l'Université de la Sorbonne]</ref>
| enregistrement =
| lectures =
*[[Perspectives on the studies, issues and problems of international history]]
*[[Europe at the centre of the world: from the end of the 19th century to 1918]]
*[[The era of the superpowers: 1918 - 1989]]
*[[A multipolar world: 1989 - 2011]]
*[[The International System in Historical Context: Perspectives and Interpretations]]
*[[The beginnings of the contemporary international system: 1870 - 1939]]
*[[World War II and the remaking of the world order: 1939 - 1947]]
*[[The international system in the test of bipolarisation: 1947 - 1989]]
*[[The post-Cold War system: 1989 - 2012]]
}}
 
The period from the end of the 19th century to the end of the First World War in 1918 saw Europe take a central place in the world. This period was characterised by significant economic, political, social and cultural changes that had a major impact on world history. Europe at the end of the 19th century was dominated by the great colonial powers, notably Britain, France, Germany and Italy, which had extended their influence throughout the world. Competition for control of colonies and markets led to an arms race and tensions between the European powers.
 
It can be seen that Europe played a central role in international relations until the end of the First World War in 1918. This was due to a combination of factors such as Europe's economic and colonial dominance of the world, the rivalry between the major European powers and their influence on world political events. However, the First World War led to a significant decline in Europe's influence in world affairs. The war led to the destruction of Europe's economy and infrastructure, resulting in a loss of economic and political power. Moreover, the war also led to major changes in the world order, with the emergence of new powers such as the United States and the Soviet Union.
 
Furthermore, the consequences of the First World War also led to the rise of nationalist movements and authoritarian regimes in Europe, which had a negative impact on the political stability of the region. The rise of Nazism in Germany in the 1930s eventually led to the Second World War and a new period of decline for Europe. Thus, although Europe dominated international relations until the end of the First World War, the war brought about a radical change in the world order and marked the beginning of a decline in Europe's influence on the international stage.


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= The European system and European order =
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The European system, established at the Congress of Vienna in 1815, based its dominance on the great powers of the time, notably France, Britain, Russia, Austria and Prussia. This system aimed to reorganise Europe following the Napoleonic wars, restoring a form of balance between the great powers. During the 19th century, this system was marked by the coexistence of old nation-states such as France and Britain, as well as the emergence of new nation-states such as Italy and Germany. In addition, empires such as the Austro-Hungarian Empire, the Russian Empire and the Ottoman Empire also coexisted with these nation-states. This coexistence was often unstable, as the great powers sought to expand their influence and territory at the expense of others, creating diplomatic and military tensions. Rivalries between the great powers also led to military alliances, which eventually led to the First World War.
|[[Introduction to the history of international relations]]
|[[Perspectives on the studies, issues and problems of international history]] ● [[Europe at the centre of the world: from the end of the 19th century to 1918]] ● [[The era of the superpowers: 1918 - 1989]] ● [[A multipolar world: 1989 - 2011]] ● [[The International System in Historical Context: Perspectives and Interpretations]] ● [[The beginnings of the contemporary international system: 1870 - 1939]] ● [[World War II and the remaking of the world order: 1939 - 1947]] ● [[The international system in the test of bipolarisation: 1947 - 1989]]
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Spanning the period from the end of the 19th century to the end of the First World War in 1918, this historic era witnessed the rise of Europe as a global pivot. It was a period marked by major transformations - economic, political, social and cultural - that had a profound impact on global history. At the end of the 19th century, Europe was controlled by major colonial powers, including mainly the United Kingdom, France, Germany and Italy. These nations extended their reach across the globe, and their rivalries for control of colonial territories and world markets led to an arms race and rising tensions on the European continent.
 
It is fair to say that Europe was a key player on the international stage right up to the end of the First World War in 1918. This pre-eminence was due to a combination of factors, including Europe's economic and colonial dominance on a global scale, the antagonism between the great European powers, and their direct influence on world political events.
 
However, the First World War led to a significant decline in European influence in international affairs. The conflict devastated the continent's economies and infrastructure, leading to a weakening of its economic and political power. The war also saw the emergence of new powers such as the United States and the Soviet Union. In addition, the repercussions of the First World War catalysed the rise of nationalist movements and authoritarian regimes in Europe, jeopardising the region's political stability. The advent of Nazism in Germany in the 1930s led to the Second World War, marking a new phase of decline for Europe. So, although Europe reigned supreme in international relations until the end of the First World War, this conflict caused a redistribution of the global balance and signalled the beginning of a decline in Europe's influence on the international stage.
 
= The European System and Order =
The European system established at the Congress of Vienna in 1815 was largely dominated by five major powers - France, the United Kingdom, Russia, Austria and Prussia. This system, sometimes referred to as the Concert of Europe, was designed to maintain the balance of power in Europe after the upheavals of the Napoleonic Wars. The Congress created a new map of Europe, redefining the borders of nations and seeking to balance the interests of the great powers to prevent further large-scale conflict. In theory, these powers undertook to respect the principles of national sovereignty and territorial integrity, and to resolve their differences through negotiation rather than war. However, during the 19th century, this system came under severe pressure. Historic nation-states such as France and Great Britain coexisted with newly emerging nation-states such as Italy (unified in 1861) and Germany (unified in 1871). At the same time, multinational empires such as the Austro-Hungarian Empire, the Russian Empire and the Ottoman Empire continued to exist, generating a series of complex tensions.
 
The balance of power established by the Congress of Vienna proved unstable. The great powers, seeking to extend their influence and territory, provoked growing diplomatic and military tensions. Prussia, for example, under the leadership of Otto von Bismarck, succeeded in unifying Germany and establishing it as a great power, thereby altering the balance of power in Europe. At the same time, the break-up of the Ottoman Empire created a power vacuum in the Balkans, leading to conflict and rivalry for control of this strategic region. Rivalries between the great powers eventually led to a series of military alliances to prevent aggression from others. However, far from preventing conflict, these alliances created a complex web of obligations that actually exacerbated tensions. The Triple Entente (made up of France, Russia and the United Kingdom) and the Triple Alliance (made up of Germany, Austria-Hungary and Italy) were ultimately the protagonists of the First World War in 1914, putting an end to the balance of power that had been established a century earlier.


During the late 19th century until the end of the First World War in 1918, Europe was considered the centre of the world. This period is marked by major social, economic and political changes, which influenced the European order and the international system. The European system of this period was characterised by intense competition between European powers for control of colonies, markets and natural resources. The major European powers, such as Britain, France, Germany, Austria-Hungary and Russia, engaged in alliances and agreements to defend their interests and protect their position in the international system. The European order of this period was influenced by several major events, such as the Franco-German War of 1870-1871 and the Russo-Japanese War of 1904-1905. The creation of the German Empire in 1871 and the annexation of Alsace-Lorraine contributed to rising tensions between the European powers, which led to the formation of alliances and the arms race. The international system in this period was also marked by significant changes. The rise of the United States and Japan as economic and military powers created a new dynamic in international relations. The First World War, which broke out in 1914, eventually led to the end of the European order and the transformation of the international system.
From the end of the 19th century to the end of the First World War in 1918, Europe stood out as the beating heart of the world. This period was characterised by far-reaching social, economic and political transformations that profoundly reshaped the European landscape and the international system. The European system of this period was characterised by exacerbated rivalry between the European powers, struggling for control of colonies, markets and natural resources. Imperialism and competition for overseas territories fuelled tensions, leading to an arms race and strategic alliances. The great powers of the time, including the United Kingdom, France, Germany, Austria-Hungary and Russia, established alliances and agreements to safeguard their interests and strengthen their position on the international stage. Systems of alliances, such as the Triple Entente (United Kingdom, France, Russia) and the Triple Alliance (Germany, Austria-Hungary, Italy), shaped European geopolitics, creating a complex web of relationships that eventually led to the First World War. In this way, this period in European history illustrates how Europe became the pivot of the world stage, as a result of internal political dynamics, imperialist ambitions and the system of alliances that was put in place among the great powers.


Britain was considered the world's leading industrial power in the 19th century, with developed textile, steel and mining industries. The Industrial Revolution had a major impact on Britain becoming the world's leading industrial power in the 19th century. It enabled Britain to develop textile, steel and mining industries, providing jobs for millions of workers. The Industrial Revolution also contributed to Britain's territorial expansion, strengthening its control over its colonial empire. It used its economic power to extend its diplomatic and political influence, and developed a powerful navy to protect its economic interests and colonies around the world. However, the Industrial Revolution also brought about a major social transformation in Britain, with massive urbanisation, population growth and the emergence of new social classes. It contributed to improved living conditions for some sections of the population, while exacerbating social and economic inequalities.
The European order during this period was profoundly influenced by several major events, such as the Franco-German War of 1870-1871 and the Russo-Japanese War of 1904-1905. The inauguration of the German Empire in 1871, following the defeat of France and the annexation of Alsace-Lorraine by Germany, considerably heightened tensions between the European powers. These tensions led to the creation of protective alliances and unbridled competition to build up military capabilities. At the same time, the international system underwent major upheavals. The rise of the United States and Japan as new economic and military powers injected a new dynamic into international relations, challenging the traditional supremacy of the European powers and redrawing the balance of power on a global scale. The First World War, which began in 1914, marked the culmination of these tensions and rivalries. This major conflict not only put an end to the European order of the time, but also indelibly transformed the international system. It led to the weakening of the European powers, the rise of the United States and the Soviet Union, and laid the foundations for a new world order in the 20th century.


The Industrial Revolution also had an impact on the great Asian empires such as China and India, which began to lose their economic and political dominance over the world. This led to a shift in the balance of power between Europe and Asia, which benefited Europe. However, despite Europe's dominance at the beginning of the 20th century, this eventually came to an end with the end of the First World War in 1918. Several factors contributed to this end of Europe. Firstly, the First World War depleted the resources of the great European powers, which weakened their influence on the world. In addition, the war resulted in the loss of lives and triggered social and political movements in European countries that challenged the established order. The rise of the United States, Russia and Japan as economic and military powers also contributed to the weakening of Europe. Europe also faced internal challenges such as the emergence of nationalist movements and tensions between the major European powers. Finally, the end of Europe was accelerated by the social and political upheavals that followed the war, such as the rise of communism, independence movements in the colonies and the emergence of new political ideologies such as fascism and Nazism. In sum, Europe's dominance in the early 20th century came to an end due to several factors, including the First World War, the emergence of new economic and military powers, internal challenges and the social and political upheaval that followed the war.
In the 19th century, Great Britain emerged as the leader of the industrial revolution, becoming the world's leading industrial power. Textile, steel and mining industries flourished, underpinning the national economy and providing employment for millions of workers. This industrial upheaval not only had an economic impact, it also profoundly changed the face of Britain, both domestically and internationally. On a national scale, the Industrial Revolution brought about a profound social transformation. The urban landscape was transformed by massive urbanisation, accompanied by explosive population growth and the emergence of new social classes. While this industrial revolution improved living conditions for some, it also accentuated social and economic inequalities, creating a growing gap between industrial workers and the ruling class. Internationally, the Industrial Revolution greatly enhanced Britain's status as a global superpower. Thanks to the economic power derived from its industrial dominance, Britain was able to extend its control over its vast colonial empire, consolidating its influence around the world. At the same time, Britain's economic power enabled it to develop a powerful navy, essential for the protection of its economic interests and colonies around the world. Britain used this naval power to secure its trade routes and extend its diplomatic and political influence beyond its borders.
 
The Industrial Revolution brought about a significant transformation in global power dynamics. Whereas powerful Asian empires such as India and China had previously dominated the global economy, the industrial rise of Europe altered this balance. As a result, the centre of global economic and political influence has shifted from Asia to Europe. However, European dominance was short-lived. Despite its pre-eminent position at the beginning of the 20th century, European hegemony began to crumble with the conclusion of the First World War in 1918. Several factors contributed to this decline. Firstly, the enormous toll of the war in terms of loss of life, material destruction and financial expenditure exhausted the great European powers. This weakened the economies of Europe, creating space for the rise of new powers, notably the United States. In addition, the war stimulated the emergence of nationalist and revolutionary movements both in Europe and in its colonies, challenging the European imperial order. For example, the Ottoman Empire was dismantled and India began to demand independence from Great Britain. Finally, the end of the war also led to the creation of new international institutions, such as the League of Nations, which sought to establish a new world order based on international cooperation rather than imperial domination. This new order ushered in a paradigm shift in global power, shifting influence from Europe to the United States and the Soviet Union, which became the new superpowers after the Second World War.
 
The dawn of the twentieth century was a crucial turning point in global history, marking the end of the European supremacy that had prevailed until then. Several factors contributed to this change of direction. The First World War inflicted considerable damage on the great European powers. The conflict drained their resources, caused catastrophic loss of life and spawned social and political movements on an unprecedented scale, shaking the status quo and diminishing Europe's weight on the world stage. This period also saw the emergence of new global forces that challenged European dominance. The United States, Russia and Japan strengthened their positions as economic and military powers, creating new centres of power and influence. Within Europe itself, a number of challenges have exacerbated the decline. The rise of nationalism and growing tensions between the great European powers have undermined the unity of the continent. In addition, the political and social upheavals that followed the First World War accelerated the process of decline. The rise of communism, independence movements in the colonies and the emergence of new political ideologies, such as fascism and Nazism, profoundly reshaped the global political landscape. In short, the end of European hegemony at the beginning of the twentieth century was the result of a complex interweaving of factors. They include the First World War, the rise of new economic and military powers, Europe's internal challenges and post-war political and social upheaval. These events ushered in a new era, during which the centre of global power gradually migrated from Europe to other parts of the world.


== The Concept of the State System ==
== The Concept of the State System ==
Since the mid-17th century, states have been considered the frame of reference in international relations. This view was formalised by the Treaty of Westphalia in 1648, which marked the end of the Thirty Years' War in Europe. This treaty established the principle of state sovereignty and put an end to the medieval idea of a universal empire. Indeed, throughout the Middle Ages, the idea of a universal empire had been in the air as a desire to recreate the Roman Empire.  
The Treaty of Westphalia, signed in 1648, marked a decisive turning point in the way international relations are structured. It put an end to the Thirty Years' War, a series of religious and political conflicts that devastated central Europe. However, its impact went far beyond the mere cessation of hostilities. One of the most important achievements of the treaty was the introduction of the concept of the sovereign nation state, which became the fundamental building block of the global political order. This concept stipulated that each state had supreme authority within its borders and that no other state should interfere in its internal affairs. This principle was also reinforced by the concept of the equality of states, according to which all states, large or small, have the same rights and are equal under international law. Before Westphalia, Europe was dominated by the idea of the universal empire, which was an attempt to recreate the political order of the Roman Empire. According to this vision, there was a hierarchical order with a single leader, such as the Holy Roman Emperor or the Pope, who exercised supreme authority over the kings and princes of the whole of Europe. The Treaty of Westphalia overturned this vision by establishing the nation state as the principal political unit. This gave greater autonomy to individual states and laid the foundations for the modern interstate system. This system, which persists to this day, is based on the principle of state sovereignty, non-interference in the internal affairs of other states and the legal equality of all states.  


With the Treaty of Westphalia, state sovereignty was recognised as a fundamental principle of international relations. This meant that each state was free to make its own political decisions and that other states had no right to interfere in its internal affairs. This idea of national sovereignty also paved the way for the formation of an international system based on the principle of the balance of power, which prevailed until the end of the 19th century.
The establishment of the principle of state sovereignty, enshrined in the Treaty of Westphalia, radically transformed the landscape of international relations. From then on, each state was master of its own internal affairs, creating a new dynamic between nations. By recognising that each state had the right to govern itself without outside interference, the Treaty of Westphalia established mutual respect for national independence and autonomy. This principle of non-interference gave rise to a new international order, characterised by a system of checks and balances. Under this system, states sought to maintain international balance by ensuring that no state or alliance of states became too powerful. This balance was maintained through constantly evolving alliances and limited wars, as nations sought to prevent the domination of any single actor.


The Treaty of Westphalia also marked the end of the power of the Holy Roman Empire, which had dominated Central Europe for centuries. This empire had collapsed during the Thirty Years' War, leaving a political vacuum in Central Europe. The Treaty of Westphalia recognised the independence of the German states, which began to organise themselves into their own political system, marking the birth of the nation-state system in Europe. This new system was based on the idea of state sovereignty and the balance of power. European states were now organised in a series of bilateral and multilateral relationships, based on common interests and diplomatic alliances. This helped to maintain a certain balance of power in Europe, thus avoiding major conflicts between the great powers. This system of nation states lasted until the end of the 19th century, but began to be challenged at the beginning of the 20th century. The arms race, imperial rivalries and nationalist tensions eventually led to the First World War, which marked the end of the nation-state system and the beginning of a new international system.
The Treaty of Westphalia marked the end of an era for the Holy Roman Empire, a complex and disparate set of political entities that had dominated Central Europe for several centuries. The Thirty Years' War, with its chaos and destruction, had undermined the structure and authority of the Holy Roman Empire, creating a political vacuum. By signing the Treaty of Westphalia, European leaders recognised the independence of the many German states that had previously made up the Holy Roman Empire. These newly autonomous political entities were able to take control of their own destiny, marking the birth of the modern system of nation states in Europe. This new system was strongly rooted in the principle of state sovereignty, stipulating that each state had the right to conduct its internal and external policies without external interference. In addition, it adopted the principle of the balance of power, according to which no state or group of states should be powerful enough to dominate others. This paradigm shift not only redefined relations between the German states, but also had a profound impact on the political structure of Europe and the world as a whole. The principles of the Treaty of Westphalia helped shape the international system we know today, based on mutual recognition of sovereign states and respect for their political autonomy.


The main principles of international relations that emerged after the Treaty of Westphalia are:
In the wake of the Treaty of Westphalia, European states structured their interactions around a series of bilateral and multilateral relationships. By forging alliances based on common interests and concluding diplomatic agreements, they sought to maintain a balance of power in order to avoid major confrontations. This created a complex web of obligations and responsibilities that shaped European politics for several centuries. However, this system of nation states began to show signs of strain at the dawn of the twentieth century. The arms race, imperial rivalry and nationalist tensions fuelled conflict and made it increasingly difficult to maintain a balance of power. The First World War marked a dramatic break in this dynamic. Not only did the conflict result in the loss of millions of lives and the destruction of large parts of Europe, it also called into question the very principles on which the nation-state system was based. The consequences of the war prompted world leaders to seek new ways of managing international relations, leading to the creation of the League of Nations and later the United Nations, marking the beginning of a new international order.


* The first principle, the balance of power, aimed to maintain a balanced distribution of power in Europe in order to prevent one power from dominating the others. This involved the formation of alliances and coalitions between states to maintain this balance and prevent major conflict.
The Treaty of Westphalia enshrined a number of key principles that have shaped international relations to this day.
* The second principle, non-interference in the internal affairs of another state, is a logical consequence of the idea of state sovereignty. Each state was free to regulate its own affairs without the intervention of other states, except in the case of a threat to collective security.
* The first, the balance of power, aimed to prevent the domination of one nation over another by maintaining a balance of power between states. It encouraged the creation of alliances and coalitions to counter any attempt at hegemony by a single entity and to prevent major conflicts.
* Finally, the principle of "Cujus regio, ejus religio" meant that the religion of the prince should be that of his people, but it also implied the right of every individual to practice his religion freely. This principle was developed to put an end to the religious wars that had torn Europe apart for centuries. The principle of "Cujus regio, ejus religio" marked the end of the political role of the Church in state affairs. During the Middle Ages, the Catholic Church was a major power in Europe, exercising considerable influence on political and social affairs. The assertion of the principle of sovereignty of the nation-state put an end to this situation by affirming that political leaders should have the responsibility to decide on the religion of their people. With the birth of nation-states, political boundaries began to be reinforced, leading to a new organisation of power in Europe. Nation-states emerged as autonomous and sovereign political entities with their own political, economic and military systems. Religion, although still important to many Europeans, lost much of its political influence, giving way to political ideologies such as nationalism, liberalism or socialism.
* The second principle, that of non-interference, developed naturally from the concept of state sovereignty. Under this concept, each state is free to manage its internal affairs without outside interference, except in the event of a threat to collective security.
* Finally, the principle of "Cujus regio, ejus religio" established that the religion of the sovereign determined that of the State, but also granted individuals the right to practise their religion freely. This clause was intended to put an end to the wars of religion that had severely fragmented Europe.


These principles formed the basis of the European system for almost two centuries, but they were tested several times during this period. The Napoleonic Wars and the First World War both shook the balance of power in Europe, while nationalist movements and territorial claims often undermined the principle of non-interference in the internal affairs of other states. It is therefore the affirmation of the nation-state.
These principles not only reinforced political borders, but also restructured the hierarchy of powers in Europe. Nation states emerged as autonomous and sovereign political entities, with their own political, economic and military systems. At the same time, religion, while remaining an important element in the lives of many Europeans, gradually lost its political influence to political ideologies such as nationalism, liberalism and socialism.


The international system that emerged after the Treaty of Westphalia was characterised by the absence of a central authority superior to that of the states. Each state was sovereign and independent, and international peace and security were ensured by the balance of power and diplomatic negotiation.
These principles of the Treaty of Westphalia were the mainstay of European political organisation for almost two centuries. However, they have been severely tested throughout history. The Napoleonic Wars and then the First World War profoundly upset the balance of power in Europe. In addition, the emergence of nationalist movements and territorial disputes have often challenged the principle of non-interference, putting the sovereignty of states to a severe test. The Treaty of Westphalia marked a decisive turning point in the role of the Church in political affairs. Whereas in the Middle Ages, the Church enjoyed major political influence, the Treaty of Westphalia established the pre-eminence of the nation state, reducing the Church to a spiritual authority. This meant the separation of church and state, a fundamental principle that continues to shape European and global politics today.


However, this relative anarchy was tested during the 19th century with the emergence of new powers and the rise of inter-state rivalries. The Napoleonic Wars disrupted the European order and led to the reorganisation of Europe at the Congress of Vienna in 1815. The great European powers established a balance of power to maintain peace, but this relative stability was threatened by the arms race, colonial tensions and national rivalries.
The post-Westphalian international system, characterised by the independence and sovereignty of states, faced many challenges in the 19th century. Imperial expansion and rivalries between the great powers led to considerable tensions. The Napoleonic Wars certainly upset the balance of power in Europe, but they also paved the way for a reorganisation of the continent at the Congress of Vienna in 1815. The major European powers then established a new balance of power aimed at preserving stability and peace. This system, sometimes referred to as the "European Concert", ensured a degree of stability for much of the 19th century. However, the end of the 19th century and the beginning of the 20th saw the emergence of new tensions. The arms race, imperial ambitions, colonial tensions and growing nationalism led to a deterioration in international relations. These factors gradually undermined the balance of power and eventually led to the outbreak of the First World War in 1914. This conflict marked the end of the world order established at the Congress of Vienna and triggered a profound transformation in international relations.


Competition between states to extend their power has been a constant in international relations since the birth of the state system. However, this competition took on a new dimension from the end of the 19th century with the emergence of new powers such as Germany and the United States, which sought to challenge the balance of power established by the great European powers. This competition also spread across the globe with the race for colonisation and imperial expansion. This quest for power eventually led to the First World War, which saw the great European powers fighting each other in an all-out war that led to the collapse of the European order. This eventually led to the First World War in 1914, which ended the balance of power and stability in Europe. After the war, a new international order was established with the creation of the League of Nations, which sought to maintain international peace and security through cooperation and diplomacy. However, this system was also tested by the rise of Nazism in Germany and rivalries between the great powers, leading to the Second World War and the creation of the United Nations in 1945.
Competition between states to increase their influence and power has been a central feature of international relations since the establishment of the nation-state system. However, this competition took on an unprecedented scale towards the end of the 19th century with the emergence of dynamic new powers, notably Germany and the United States. These nations challenged the pre-established balance, which was dominated mainly by the great European powers. Moreover, this race for power was not limited to Europe. It became global with colonisation and imperial expansion, where European nations, but also the United States and Japan, competed to establish their dominance over other regions of the world. This rivalry for global ascendancy came to a head with the outbreak of the First World War. The great European powers found themselves engaged in a total war, which not only devastated the belligerent nations but also radically altered the world political map. The war marked the end of the European order and precipitated a profound reorganisation of international relations.


Although the First World War disrupted the European system, nation states remain the main actors in international relations to this day. However, their role has changed over time. In the 20th century, with the emergence of new challenges such as globalisation, terrorism and climate change, states had to adapt and intervene in new areas such as health, education and the environment. Thus, although the European system has disappeared, states remain key players in international relations, while expanding their scope of action beyond political and military issues.
Rivalry between the world powers and escalating tensions finally led to the outbreak of the First World War in 1914, putting an end to the fragile balance of power and stability that Europe had enjoyed until then. The war profoundly transformed the political map of the world, and in the wake of this devastating conflict, a new international order was established. The League of Nations was created with the aim of preserving international peace and security through cooperation and diplomacy. By creating a platform for dialogue between nations, the ambition was to resolve conflicts by peaceful rather than military means. However, despite these noble intentions, this new order was put to the test with the advent of Nazism in Germany and the continuing tensions between the Great Powers. These challenges, which the League of Nations proved unable to address effectively, led to another devastating world war. In the aftermath of the Second World War, the United Nations Organisation (UNO) was created in 1945, in the hope of filling the gaps left by the League of Nations. The UN sought to establish an international system that would promote not only peace and security, but also international cooperation in areas such as human rights and economic development.
 
Although the traditional European system was shaken by the devastation of the First World War, the concept of the nation state has not lost its relevance and remains at the heart of contemporary international relations. Nevertheless, the role and responsibilities of nation states have changed considerably over time. With the emergence of complex global challenges in the 20th century, such as globalisation, international terrorism and climate change, among others, states have been forced to revise and broaden their scope of intervention. These new challenges, which transcend national borders, have necessitated greater international cooperation in areas hitherto largely left to the discretion of individual states, such as public health, education and environmental protection. These developments have reaffirmed the central role of states in the management of international affairs, but in an increasingly globalised and interconnected context. Consequently, despite the demise of the classic European system, states continue to be key players in international relations. However, they are now doing so within a broader framework, which goes beyond political and military issues to encompass a multitude of areas affecting the well-being of the world's population.


== Nation-States vs. Empire-States ==
== Nation-States vs. Empire-States ==


Nation states and empire states have different characteristics. Nation states are sovereign states that are defined by their common territory, language, culture and history. They are often composed of a single ethnic or linguistic group, and their government is elected by the population. Examples of nation states are France, Germany and Japan. Empire states, on the other hand, are states that are composed of several different ethnic or linguistic groups, and their territory can often span several continents. Examples of empire states are Russia and the Ottoman Empire. These states are often governed by an elite that is perceived as foreign or colonial by the indigenous populations.
Nation states and empire states have different characteristics.  
 
A nation state is a type of political structure that has a largely homogenous population in terms of culture, history and language, and has defined and recognised borders. The government of this state has legal sovereignty over this territory and is recognised by other nation states. France, Germany and Japan are typical examples of nation states, in the sense that they have a distinct national identity based on shared culture, language and history. These unifying elements contribute to a strong and cohesive national identity.
 
An empire state is a political structure made up of various nations, ethnic or linguistic groups, often brought together by conquest. Unlike nation states, empire states can extend over vast territories and encompass a wide variety of cultures, histories and languages. Russia is a good example of a modern empire state, as it spans a large part of Eurasia and is home to a diversity of peoples and cultures. Historically, the Russian Empire, and later the Soviet Union, sought to integrate these diverse groups into a single state, sometimes by force. The Ottoman Empire is another example of a historical empire-state. From the 14th century until the end of the First World War, the Ottoman Empire controlled a vast territory that spanned three continents and included diverse peoples and cultures, including Turks, Arabs, Greeks, Armenians and many others. In these states, power was generally centralised in the hands of a ruling elite, which could be perceived as alien or even oppressive by certain groups within the empire. This can lead to tension and conflict, as we saw with the many nationalist movements that emerged in European empires in the 19th and 20th centuries.
 
Nation states and empire states have different histories in Europe.


Nation states and empire states have different histories in Europe. Nation-states emerged in Europe in the nineteenth century, with the idea that each ethnic or linguistic group should have its own independent state. This led to the emergence of new states such as Germany and Italy, and to the redrawing of the borders of many existing states. Empire states, on the other hand, have been a feature of Europe since the Middle Ages, with examples such as the Germanic Roman Empire and the Ottoman Empire. These states have often been characterised by conflicts between different ethnic and religious groups, as well as tensions between the centres of power and the peripheries.
The 19th century in Europe was marked by the nationalism movement, which promoted the idea that each nation, defined by a common language, culture, history and values, should have its own independent state. This movement played a key role in the emergence of modern nation states and the redefinition of political boundaries in Europe. In Germany, for example, the unification process was largely led by the Kingdom of Prussia under Chancellor Otto von Bismarck. Through a series of wars and political manoeuvres, Bismarck succeeded in uniting the various German states into a single nation, creating the German nation-state in 1871. Similarly, in Italy, the unification process known as the Risorgimento led to the unification of several small states and kingdoms into a single Italian nation in 1861. This process was guided by various leaders and political movements, the most notable of which was probably Giuseppe Garibaldi and his Army of a Thousand.


Despite their differences, both nation states and empire states have played an important role in European history. Nation states have often been associated with democracy and national liberation, while empire states have often been associated with imperialism and foreign domination.
Empires have had a significant presence in European and world history, often extending over immense territories and encompassing a multitude of ethnic, linguistic and religious groups. These imperial states, unlike nation states, were not based on a single, shared national identity, but were often the result of conquest and territorial expansion. The German Roman Empire, which existed from the tenth century until its dissolution in 1806, was a complex political structure comprising numerous kingdoms, duchies, principalities, free cities and other political entities. Despite its name, it was not a homogeneous empire, but rather a collection of more or less autonomous territories that were united under the authority of the Germanic Roman Emperor. The Ottoman Empire, for its part, was one of the most powerful empires in history, extending at its height over three continents (Europe, Asia and Africa) and lasting for more than six centuries (from the end of the 13th century until the end of the First World War in 1918). This empire was a mosaic of peoples of different religions, languages and cultures, and its governance was often marked by tensions between the imperial centre (the Sublime Porte) and the provinces. Managing ethnic, religious and linguistic diversity was often a major challenge for these empires. While some adopted policies of assimilation or suppression of local identities, others opted for more decentralised systems of governance, allowing a degree of autonomy to different regions or ethnic groups. However, tensions and conflicts were often inevitable, particularly during periods of crisis or imperial decline.
 
Both nation states and empire states have had profound and lasting influences on the course of European and world history.
 
The emergence of nation states has often been linked to national liberation movements and the assertion of a specific national identity. These movements have often been inspired by ideals of freedom, democracy and self-determination. Nation states are often seen as the ideal framework for democracy, as they allow a community of people with a common language, culture and history to govern themselves. However, they have also often been marked by internal conflict and ethnic tensions, particularly in cases where national borders do not correspond to ethnic divisions.
 
Empire states, on the other hand, have often been associated with imperialism and foreign domination. They have been characterised by centralised and often authoritarian systems of government, and have often been built by force and conquest. However, they also created areas of stability and relative peace, and often encouraged trade and cultural exchange over vast regions. In addition, some empires established relatively efficient systems of administration and left lasting legacies in the fields of art, science and philosophy.


=== Traditional Nation-States ===
=== Traditional Nation-States ===
The ''United Kingdom'' was one of the great European powers of the 19th century due to its privileged position as the leading maritime and trading power. It was also one of the main players in the European system of the time, seeking to maintain a balance of power between the various European powers to avoid conflict. The United Kingdom was also endowed with a powerful industry, based on the industrial revolution that began in its territory, allowing it to dominate international trade and become the world's leading financial power. Its colonial empire was also very large, providing it with significant economic resources and global power status. However, despite its dominant position, the UK also faced internal and external challenges, including the Irish question and growing competition with other European powers such as Germany.


Austria was a continental empire that played an important role in the defeat of Napoleon. It was ruled by Emperor Franz I, who was also King of Hungary and Bohemia. At the end of the 18th century, Austria was a major power in Europe and its capital, Vienna, was an important cultural centre. At the Congress of Vienna, Metternich, the Austrian Foreign Minister, played a decisive role in the reorganisation of Europe. He was in favour of a balance of power between the great European powers in order to avoid domination by one state over the others. He also wanted to restore the old monarchical regimes and crush any revolutionary tendencies. Thus the Congress of Vienna redrawn the map of Europe by re-establishing the monarchies deposed by Napoleon and creating new nation states such as Belgium and Norway. Despite this, Austria was to experience difficulties during the 19th century, particularly with the nationalist movements that emerged in the various territories of the Empire, which was composed of many different ethnic groups. This internal instability weakened Austria and contributed to its defeat in the First World War.
==== The United Kingdom ====
The United Kingdom played a central role in European and world politics during the 20th century, thanks to its industrial and naval power, its vast colonial empire and its dominant position in world trade and finance. The Industrial Revolution, which began in the UK at the end of the 18th century, transformed the British economy and enabled the country to become the "factory of the world". British industry, based on coal and iron, produced a wide range of manufactured goods that were exported around the world. The UK was also a world centre for technological and scientific innovation, with advances in fields such as engineering, chemistry and biology. As the world's leading naval power, the UK controlled key sea routes and protected its commercial interests around the world. Its navy played a key role in the defence of the British Empire, which spanned every continent and included territories such as India, Canada, Australia, South Africa and many islands in the Caribbean and the Pacific. However, the United Kingdom also faced challenges during the nineteenth century. The question of Ireland, where a large proportion of the population aspired to independence, was a constant source of tension. In addition, the rise of new industrial powers, notably Germany and the United States, began to challenge the United Kingdom's dominant position at the end of the century. At the same time, social and political movements within the UK, such as the universal suffrage movement and the workers' movement, also challenged the status quo and led to significant changes in British society.


Prussia was the third major player in the coalition against Napoleon. Between 1815 and 1879, Prussia tried to unite under its rule the German-speaking regions that had resulted from the break-up of the Holy Roman Empire. This was the period of the formation of Germany as a nation state, with the creation of the German Empire in 1871 under the leadership of Prussia and its chancellor Otto von Bismarck. The German Empire became the leading economic power in Europe with its booming industry and developed railway network. However, the unification of Germany took place against a backdrop of tensions with other European powers, particularly France, which lost Alsace-Lorraine to Germany in the Franco-German war of 1870-1871. This situation contributed to the rise in tensions in Europe that led to the First World War in 1914.
==== Austria ====
Austria was a continental empire that played an important role in Napoleon's defeat. It was ruled by Emperor Francis I, who was also King of Hungary and Bohemia. By the end of the 18th century, Austria was a major power in Europe and its capital, Vienna, was an important cultural centre. At the Congress of Vienna, Metternich, the Austrian Foreign Minister, played a decisive role in the reorganisation of Europe. He was in favour of a balance of power between the great European powers to avoid any one state dominating the others. He also wanted to restore the old monarchical regimes and crush any hint of revolution. As a result, the Congress of Vienna was to redraw the map of Europe by re-establishing the monarchies deposed by Napoleon and creating new nation states such as Belgium and Norway. Despite this, Austria was to experience difficulties during the 19th century, particularly with the nationalist movements that emerged in the various territories of the Empire, which was made up of many different ethnic groups. This internal instability weakened Austria and contributed to its defeat in the First World War.


After the fall of Napoleon, France renounced any hegemonic ambitions in Europe, but continued to expand its colonial empire. However, it retained an important cultural influence in Europe, particularly in the arts and literature. During the 19th century, France also experienced a period of modernisation and economic prosperity, with the development of industry and railways. However, the defeat by Prussia in 1870 and the loss of Alsace-Lorraine marked a turning point in France's history and weakened its influence in Europe.
Austria was a major power in Europe for several centuries, playing a central role in European affairs. The Austrian Foreign Minister, Prince Metternich, was an influential figure at the Congress of Vienna in 1814-1815, which sought to restore the balance of power in Europe after the Napoleonic Wars. Metternich was a staunch defender of the monarchy and opposed any form of revolution or radical change. However, Austria's multinational empire included many different ethnic groups, including Hungarians, Czechs, Poles, Croats, Serbs, Italians and Germans, among others. This created internal tensions, as many groups aspired to greater autonomy or independence. These tensions erupted in the revolutions of 1848, which shook the empire but were eventually suppressed. Nevertheless, these tensions persisted throughout the nineteenth century and contributed to the instability of Austria-Hungary, as the empire became known after the Austro-Hungarian Compromise of 1867. Ultimately, these tensions, combined with external challenges such as rivalry with Prussia and the rise of Serbian nationalism, led to the collapse of Austria-Hungary during the First World War.
 
==== Prussia ====
Prussia played an important role in the coalition against Napoleon. After an initial defeat by Napoleonic France at the Battle of Jena-Auerstedt in 1806, Prussia was forced to submit to Napoleon and become a satellite state of the French Empire. However, Prussia finally broke its ties with Napoleon and joined the anti-Napoleonic coalition in 1813. Prussia's participation in the war of the Sixth Coalition was decisive in Napoleon's eventual defeat. Prussian forces played a key role in several important battles, including the Battle of Leipzig in 1813, also known as the "Battle of the Nations", which marked a turning point in the war against Napoleon. In 1815, Prussian forces, commanded by Field Marshal Gebhard Leberecht von Blücher, played a crucial role in helping British and Allied troops achieve final victory over Napoleon at the Battle of Waterloo. Prussia's participation in Napoleon's defeat greatly enhanced its position and prestige in Europe. It paved the way for its later role in the unification of Germany under Prussian leadership in the decades following the Napoleonic Wars.
 
Prussia played a key role in the unification of the German states in the 19th century under the leadership of Chancellor Otto von Bismarck. The creation of the German Empire in 1871 marked a turning point in European history. Germany became a major economic and military power in Europe, competing with the continent's other great powers, in particular the United Kingdom and France. German unification took place against a backdrop of international tensions and rivalries. The Franco-German War of 1870-1871 not only marked the end of the French Second Empire, but also triggered a series of conflicts and tensions in Europe that led to the First World War. France's loss of Alsace-Lorraine was a persistent source of tension between France and Germany, which ultimately contributed to the outbreak of war in 1914. Overall, the formation of Germany as a nation state profoundly transformed the balance of power in Europe and had a major impact on European and world history in the 20th century.
 
==== France ====
After the fall of Napoleon in 1815, France was forced to focus on internal reorganisation and consolidation, which included a series of revolutions and regime changes. However, it continued to extend its influence on a global scale through its colonial empire, which expanded considerably during the 19th century. In Europe, France has maintained a significant cultural influence, often being regarded as the cradle of the arts, literature and philosophy. Cities such as Paris served as a focal point for artistic and cultural movements, attracting artists, writers and thinkers from all over the world. Despite its internal political challenges, France also underwent significant economic modernisation during the 19th century. With the development of industry and railways, it saw significant economic growth. However, defeat at the hands of Prussia in the Franco-Prussian War of 1870-1871 had a major impact on France's status as a major European power. The loss of Alsace-Lorraine was a major blow to France, and this defeat eventually led to the end of the Second Empire and the establishment of the Third Republic. This event marked a turning point in French history and served as a catalyst for a period of national introspection and reform.


=== Recently Affirmed Nation-States ===
=== Recently Affirmed Nation-States ===


Germany asserted itself by relying on nationalism. German unity was achieved under the aegis of Prussia in January 1871. On the other hand, this unity will be achieved by the war against Austria in particular, in 1866, and against France in 1870. These conflicts were to unify the nation internally by mobilising against external enemies. Austria wanted to create Germany itself by integrating all German-speaking peoples into its empire, being opposed to the Prussian idea of a German Empire independent of Austria. Germany is an incomplete nation-state, since it does not include Austria, where German-speaking peoples live.
==== Germany ====
German unification was a complex and conflict-ridden process that took place over several decades. It was largely orchestrated by the Kingdom of Prussia and its Chancellor, Otto von Bismarck. Bismarck used both diplomacy and military force to unify the various German states under Prussian hegemony. One of his strategies was to mobilise German nationalism to unite the German states against common enemies. This was clearly illustrated in the wars against Austria in 1866 (known as the Austro-Prussian War or the Seven Weeks War) and against France in 1870 (the Franco-Prussian War). Interestingly, German unification was a major source of tension in Europe. Austria, which had a large German-speaking population, was not included in the new German Empire. This created some ambiguity about Germany's identity as a nation state and was a source of conflict in the decades that followed.


Italy is fragmented until 1861. National unity was achieved through war against the Austro-Hungarian Empire, which included Italian-speaking populations. Italian unity was incomplete: Trentino and Istria, which constituted the Irredent Lands, were regions that were part of the Austro-Hungarian Empire. Italy considered it incomplete and tried to recover Trentino and Istria during the First World War. France supported Italy and was ceded Savoy by the latter. Within these exchanges, popular wills play little role.
==== Italy ====
Like Germany, Italy was unified in the mid-nineteenth century, after a series of wars and diplomatic manoeuvres. The movement for Italian unification, known as the Risorgimento, was largely inspired by the ideals of nationalism and liberalism. Italian-speaking populations were scattered across various independent states and kingdoms, as well as territories under foreign control, particularly the Austrian Empire. The Italian Wars of Independence, which took place between 1848 and 1866, were mainly directed against Austria and enabled Italy to gain independence and unification. However, the unification of Italy was incomplete. Some regions with Italian-speaking populations, such as Trentino and Istria (the "Irredent Lands"), remained under Austrian control. These territorial claims were a source of tension in international relations, and Italy eventually succeeded in annexing these territories after the First World War. It is also true that the unification process was often led by a political and military elite, with limited popular participation. However, nationalist sentiment was fairly widespread among the Italian-speaking population, which contributed to the success of unification.


=== The Structure and Role of Empire States ===
=== The Structure and Role of Empire States ===


Europe at the time was made up of many multinational empires, which brought together populations of different languages, cultures and religions. The Russian Empire was the largest of these empires, with a great diversity of ethnic and religious groups. The Ottoman Empire included Turkish, Arab, Kurdish, Armenian, Greek, Bulgarian, Romanian and other ethnic groups. Austria-Hungary was composed of many ethnic groups, including Germans, Hungarians, Czechs, Slovaks, Poles, Ruthenians, Croats, Slovenes and Romanians. These multinational empires all experienced internal tensions due to the diversity of populations within them.
==== The multinational empires ====
Multinational empires were quite common in Europe at the time, and they often represented a challenge in terms of managing ethnic, linguistic and religious diversity. The Russian Empire, the Ottoman Empire and Austria-Hungary - are good examples of these challenges. The Russian Empire, which spanned much of Eurasia, included many different ethnic and linguistic groups, including Russians, Ukrainians, Belorussians, Tatars, Georgians, Armenians, Jews and many others. The empire was mainly Orthodox, but also had a large Muslim population, particularly in the Caucasus and Central Asia. The Ottoman Empire was even more ethnically and religiously diverse. It included Turkish, Arab, Kurdish, Greek, Armenian, Jewish and other ethnic groups. The Empire was predominantly Muslim, but also included significant Christian and Jewish populations. Austria-Hungary, also known as the Austro-Hungarian Monarchy, consisted of two separate entities - Austria and Hungary - which were linked by a personal union under the rule of the Austrian Emperor and the Hungarian King. Each entity had its own administration, legislation and education system. Austria-Hungary was also ethnically and linguistically diverse, with Germans, Hungarians, Czechs, Slovaks, Poles, Ruthenians (Ukrainians), Romanians, Croats, Serbs and other ethnic groups. In all these empires, internal tensions were a constant feature, as different groups sought to preserve their culture, language and religion, and often also to gain greater autonomy or independence. These tensions ultimately contributed to the dissolution of these empires after the First World War.


The dynastic and monarchical system was re-established in Europe after the fall of Napoleon in 1815, in order to preserve stability and counter French hegemonic ambitions.  The post-Napoleon European order was based on the restoration of monarchies and dynasties, in opposition to revolutionary and nationalist ideals. The great European powers sought to preserve the balance of power by avoiding conflict, and to this end they sought to maintain the existing multinational empires and to curb the national aspirations of the peoples within them. However, this policy of repressing nationalities also contributed to the resentments and tensions that led to the upheavals of 19th century Europe. However, this system was undermined by the rise of nationalism, which questioned the legitimacy of multinational empires such as Russia, Austria-Hungary or the Ottoman Empire, which were based on the political and cultural domination of one group over others. Nationalist movements sought to assert the national identity of each people and to claim their right to self-determination, i.e. the right to choose their own political destiny and to form an independent nation state. This demand was one of the main causes of the First World War.
The Congress of Vienna in 1815, which redrew the map of Europe after Napoleon's defeat, re-established the monarchical system in many countries and sought to preserve the balance of power in Europe. This order was led by the great powers of the day - Austria, Russia, Prussia and the United Kingdom - and is often referred to as the "Metternich System" after the Austrian chancellor who played a key role at the Congress of Vienna. This system sought to control the nationalist and revolutionary movements that had spread across Europe following the French Revolution and the Napoleonic Wars. The rulers of the time feared that these movements would destabilise their own countries and threaten the established order. However, this policy of repressing nationalist movements and aspirations for independence often had the opposite effect, fuelling resentment and exacerbating tensions. Over the course of the nineteenth century, these tensions erupted several times, leading to revolutions and wars of independence in many parts of Europe. These conflicts ultimately undermined Metternich's system and led to the rise of the modern nation states we know today.


The Austro-Hungarian Empire was one of the main pillars of the European order that emerged from the Congress of Vienna in 1815. However, this multicultural and multilingual empire faced many internal challenges, such as the nationalist demands of the different peoples within it, as well as tensions between the different provinces and regions; this eventually led to its break-up in 1918-1919. The rivalry between Austria-Hungary and Prussia for the regrouping of the German populations contributed to the weakening of the Austro-Hungarian Empire. After the defeat of Prussia in 1866, Austria had to abandon its hegemonic ambitions in Germany and was forced to recognise Prussia's superiority. This defeat undermined the credibility of the Austrian monarchy and increased the demands for independence of the different national groups within it.  
Nationalism was a key factor in destabilising the established order in Europe during the nineteenth and early twentieth centuries. In many multinational empires, different nationalities began to claim their right to self-determination, leading to internal tensions and, in some cases, revolutions and wars of independence. Austria-Hungary, for example, was a multinational empire made up of many different nationalities, including Hungarians, Czechs, Slovaks, Croats, Serbs, Romanians and others. Each of these groups had its own cultural and linguistic identity, and many aspired to have their own independent nation-state. These nationalist aspirations led to internal tensions and conflicts, and ultimately contributed to the collapse of the empire after the First World War. Similarly, in the Ottoman Empire, the various nationalities under Ottoman rule - notably the Greeks, Armenians and Arabs - began to demand their independence, contributing to the destabilisation of the empire. Finally, imperialism and colonial rivalries between the great European powers also contributed to the rising tensions that led to the First World War. Each power sought to extend its influence and secure its interests, often at the expense of the others, leading to a series of alliances and counter-alliances that ultimately triggered the outbreak of the conflict in 1914.


The tensions between the different national communities in the Austro-Hungarian Empire also contributed to its weakening. The demands for independence of the various nationalities, particularly the Czechs, Slovaks, Croats, Slovenes and Poles, created internal divisions within the empire. This situation was exacerbated by the opposition between the Austrians and the Hungarians, who obtained the Austro-Hungarian compromise of 1867, granting Hungary some autonomy within the empire. These problems escalated during the 19th century, and the disintegration of the Austro-Hungarian Empire eventually led to the collapse of the European order. The First World War, triggered largely by the assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, was the trigger for this disintegration. After the war, the Austro-Hungarian Empire was dismantled, leading to the creation of new nation states such as Czechoslovakia and Yugoslavia.
==== The Austro-Hungarian Empire ====
The Austro-Hungarian Empire, under the leadership of the House of Habsburg, was a major player in Europe for several centuries. However, in the late 19th and early 20th centuries, the empire faced a series of internal and external challenges that eventually led to its collapse. Within the empire, ethnic and nationalist tensions intensified. Many ethnic groups, including Czechs, Slovaks, Serbs, Croats, Romanians and Hungarians, began to demand greater autonomy or even total independence. These tensions were exacerbated by the Austro-Hungarian duality of 1867, which granted more autonomy to Hungary but left many other ethnic groups dissatisfied. Outside the empire, Austria-Hungary also faced challenges. The Austro-Prussian War of 1866 marked a decisive turning point, with Prussia's victory asserting its supremacy over the German states and reducing Austria's influence. At the same time, the empire had to contend with the hostility of Russia and Italy, as well as competition from the Ottoman Empire for control of the Balkans. The outbreak of the First World War in 1914 exacerbated these internal and external tensions. Despite tenacious resistance, the Austro-Hungarian Empire was eventually defeated and imploded at the end of the war in 1918, giving rise to several new nation states in Central and Eastern Europe.  


The Austro-Hungarian Empire was a rival to Germany and thus to Prussia for a regrouping of the German populations. The defeat of 1866 against Prussia sounded the death knell of this dream, the Austrian monarchy was weakened, the internal populations progressively demanded their autonomy, which culminated in the break-up of the empire in 1919. After Austria's defeat by Prussia in 1866, the Austrian Empire was often referred to, which also included Hungary as part of the Empire. However, after the defeat, Austrian Emperor Franz Joseph was forced to negotiate a compromise with the Hungarian leadership to keep the empire together. The compromise of 1867 thus created the Austro-Hungarian Empire, where Hungary had greater political autonomy and created a duality in the Empire. From this point on, the Empire is often referred to as the Austro-Hungarian Empire, reflecting the increased participation of Hungarians in the government of the Empire. The Austro-Hungarian Compromise of 1867 led to the transformation of the Austrian Empire into a two-headed empire, the Austro-Hungarian Empire, in which the Hungarians were given a large measure of autonomy. This duality and opposition between Austrians and Hungarians created internal tensions that weakened the empire. In addition, the rise of nationalism in the Balkans, particularly among the Slavs, created territorial and independence claims that undermined the cohesion of the empire. This situation contributed to the disintegration of the Austro-Hungarian Empire after the First World War.
The Austro-Hungarian Empire faced many internal pressures due to the nationalist aspirations of its various ethnic communities. The Compromise of 1867, which created a dual monarchy by granting greater autonomy to Hungary, may have eased some problems, but it exacerbated others by fuelling the frustrations of other national groups who did not benefit from such privileged treatment. These internal tensions were compounded by a series of external problems, including rivalry with Russia, Italy and Prussia (later to become the nucleus of a united Germany). The defeat of Austria-Hungary in the Austro-Prussian War of 1866 marked a turning point, reducing Austria's influence in German affairs and leaving Prussia as the dominant power. The assassination of Archduke Franz Ferdinand in 1914 triggered the First World War, which finally sounded the death knell for the Austro-Hungarian Empire. At the end of the war, the empire was dismantled and replaced by a series of new nation states, including Czechoslovakia and Yugoslavia, reflecting the nationalist aspirations that had contributed to its downfall. These changes radically altered the political landscape of Central Europe and had profound repercussions on twentieth-century European history.


The Russian Empire was a multinational empire comprising populations such as Russians, Ukrainians, Belorussians, Caucasians, Central Asians, Poles, Balts, Finns, among others. Russia experienced several nationalist uprisings and internal revolutions, notably in 1905 and 1917, which weakened Tsarist power and contributed to the collapse of the empire in 1918. National liberation movements were also an important factor in the disintegration of the Russian Empire.
The Austrian Empire was seriously weakened after its defeat by Prussia in the Austro-Prussian War in 1866. This defeat not only strengthened Prussia's position as the dominant power in the German-speaking world, but also exacerbated internal tensions within the Austrian Empire. Emperor Franz Joseph I had to make concessions to Hungarian leaders, who had agitated for greater autonomy, in order to preserve the integrity of the empire. This led to the Compromise of 1867, which transformed the Austrian Empire into a dual empire, known as the Austro-Hungarian Empire. The Hungarian rulers were given a large measure of autonomy, including their own government and administration, although some matters, such as defence and foreign affairs, remained under common control. However, this solution did not satisfy the many other ethnic groups that made up the empire. Demands for autonomy and independence from various nationalities, including the Czechs, Slovaks, Romanians, Serbs and Ukrainians, continued to destabilise the Austro-Hungarian Empire, eventually contributing to its disintegration after the First World War.


The Ottoman Empire, the "sick old man of Europe", came under a lot of pressure from the European Great Powers during the 19th century, especially because of the Eastern Question, i.e. the question of who would take control of the Ottoman Empire's territories in the Balkans and the Middle East. The great powers competed for hegemony over the region, each seeking to extend their political and economic influence. Russia was interested in dismantling the Ottoman Empire to extend its influence into the Balkans, the Black Sea and the Straits. However, the other major European powers were also involved in political and economic rivalries for the wealth and territories of the Ottoman Empire. Britain, for example, was interested in the trade routes to India and Asia, while France sought to protect its interests in the Mediterranean region. These rivalries contributed to the fragmentation of the Ottoman Empire from the 19th century onwards, leading to wars, diplomatic crises and international treaties that undermined the Ottoman Empire's sovereignty. In addition, the rise of nationalism among Arab and Balkan populations also undermined the authority of the Ottoman Empire, as these populations increasingly sought independence and the formation of separate national states. All this eventually led to the collapse of the Ottoman Empire after the First World War. Some European powers were against the break-up of the Ottoman Empire because they feared the instability and conflict that might ensue. In particular, the UK had an interest in maintaining the Ottoman Empire as a buffer between the British possessions in India and Russian ambitions in the region. However, as the situation of the Ottoman Empire deteriorated over time, the European powers eventually participated in its dismemberment, particularly after the First World War. This was particularly the case for the United Kingdom which, after the opening of the Suez Canal in 1869, began to become more involved in the dismemberment of the Ottoman Empire. The canal was an important sea route linking Europe and Asia, and control of this route was strategic for trade and imperial rule. The UK supported Greece in its war of independence against the Ottoman Empire in 1821, and occupied Egypt in 1882 before becoming involved in the First World War alongside the Allies against the Central Empires, of which the Ottoman Empire was a part.
The duality of the Austro-Hungarian Empire created internal tensions. While Austria and Hungary were linked by a common monarchy, each had its own parliament and administration. This structure led to a kind of competition between the two parts of the empire, each seeking to preserve and extend its own interests. This situation was complicated by the fact that the empire was also populated by a large number of other nationalities, who were unhappy with their minority status and sought greater autonomy or even independence. Nationalism played a crucial role in the weakening of the Austro-Hungarian Empire. Many ethnic groups within the empire were influenced by the pan-Slav movement, which sought to unite all Slavic peoples under a single political entity. This was particularly evident in the Balkans, where the empire faced a series of crises and wars during the latter part of the 19th century. The First World War finally proved to be the final blow for the Austro-Hungarian Empire. After the empire's defeat in the war, the various nationalities that made it up managed to gain their independence, leading to the creation of several new states in Central and Eastern Europe.
 
==== The Russian Empire ====
The Russian Empire was an extremely large and diverse multinational state, spanning much of Eastern Europe, Northern Asia and Central Asia. Russians were the largest ethnic group and Russian was the official language of the empire. However, there were also a large number of other ethnic groups living in the Russian Empire, each with their own language, culture and traditions. These included Ukrainians, Byelorussians, Tatars, Jews, Poles, Balts (Lithuanians, Latvians, Estonians), Georgians, Armenians, Azerbaijanis, Kazakhs, Uzbeks, Turkmen and many others. However, the Russian Empire was not a multicultural state in the modern sense of the term. The various nationalities were generally subject to a policy of "Russification", which sought to promote the Russian language and culture at the expense of other cultures. This policy often created tensions between the Russian government and the various nationalities, and was one of the causes of the unrest that eventually led to the collapse of the Russian Empire in the Russian Revolution of 1917.
 
The early years of the 20th century were marked by a series of uprisings and revolutions that eventually led to the collapse of the Russian Empire. The 1905 revolution was triggered by a series of strikes, demonstrations and military uprisings. It was sparked by a combination of popular discontent with the Tsarist autocracy, dissatisfaction with economic conditions and reaction to Russia's defeat in the Russo-Japanese War. Although this revolution failed to overthrow the Tsar, it did lead to significant reforms, including the creation of a legislative assembly, the Duma. The 1917 revolution was a period of major political and social unrest that eventually led to the fall of the Russian Empire and the birth of the Russian Soviet Federative Socialist Republic. The revolution began in February (or March, according to the Gregorian calendar) with a series of strikes and demonstrations in Petrograd (now St Petersburg), which quickly developed into a national revolution. Tsar Nicholas II abdicated in March, ending more than 300 years of rule by the Romanov dynasty. These revolutions were fuelled by a variety of factors, including popular dissatisfaction with the Tsar's autocratic rule, economic hardship, social and ethnic tensions, and Russia's catastrophic losses in the First World War.
 
Imperial Russia was an ethnically and culturally diverse entity, made up of many different nationalities. Tensions between these different groups played an important role in the destabilisation and eventual disintegration of the Empire. During the 19th century, many of these nationalities began to develop a stronger nationalist sentiment. This was fuelled by a combination of factors, including the economic, political and cultural oppression of Imperial Russia, as well as the influence of European nationalist and liberal ideas. In particular, Poles, Finns, Balts, Ukrainians, Georgians, Armenians and various groups in Central Asia and the Caucasus all experienced significant nationalist movements. Some of these movements sought greater autonomy or cultural rights within the Russian Empire, while others sought total independence. When the revolution of 1917 broke out, many of these groups seized the opportunity to push their demands. In the chaos that followed, several national republics emerged, some of which succeeded in gaining lasting independence, such as Finland, Lithuania, Latvia and Estonia. Overall, the national liberation movements played a crucial role in the disintegration of the Russian Empire and helped shape the political landscape of Eastern Europe and Eurasia in the 20th century.
 
==== The Ottoman Empire ====
The Ottoman Empire became a major target of European imperialist ambitions during the 19th century. The empire, which had once been a major player on the European stage, was gradually weakened by a series of internal revolts, economic problems and wars with its European neighbours. The great European powers, seeking to extend their influence, waged a series of wars and diplomatic conflicts known as the "Eastern Question". These conflicts often revolved around the question of how to deal with the decline of the Ottoman Empire and how to divide up its vast territory. Each major power had its own interests in the Ottoman Empire. Russia, for example, was seeking to extend its influence in the Balkans and had a particular interest in gaining access to the Dardanelles and the Bosphorus to guarantee its fleet access to the Mediterranean. Similarly, Britain and France were also interested in protecting their trade routes and economic interests in the region. The involvement of the great powers often exasperated ethnic and religious tensions within the Ottoman Empire, helping to trigger a series of Balkan wars in the early 20th century. These wars further weakened the Ottoman Empire and paved the way for its eventual dismantling after the First World War.
 
The Ottoman Empire gradually lost control over various territories during the 19th century. For example, Greece gained its independence after the Greek War of Independence (1821-1832). Similarly, Serbia, Romania, Montenegro and Bulgaria gained increasing autonomy throughout the 19th century, culminating in complete independence following the Balkan Wars (1912-1913). In the 20th century, during the First World War, the Ottoman Empire aligned itself with the central powers (Germany, Austria-Hungary). With the defeat of the central powers in 1918, the Ottoman Empire also collapsed. The Treaties of Sèvres (1920) and Lausanne (1923) officially put an end to the Ottoman Empire, reducing Turkey to its current borders and dividing the rest of the Ottoman Empire between the Allied Powers.
 
The policy of the United Kingdom and certain other European powers towards the Ottoman Empire was guided by a mixture of rivalry and pragmatism. On the one hand, they wanted to control certain parts of the Ottoman Empire for their own interests. On the other, they were also concerned about the instability that might result from the collapse of the Empire. It was precisely this mix of interests that guided British policy towards the Ottoman Empire. The UK saw the Ottoman Empire as a useful "buffer state" against Russian expansion southwards, which could threaten India, the "pearl in the crown" of the British Empire. For this reason, for much of the nineteenth century, the UK sought to maintain the territorial integrity of the Ottoman Empire. This is known as the "policy of balance", which aimed to preserve a balance of power in Europe by preventing any country (including Russia) from becoming too strong. However, this policy changed over time, particularly with the opening of the Suez Canal, which made Egypt (an Ottoman territory) of vital importance to the UK. This led to the British occupation of Egypt in 1882. In addition, at the beginning of the 20th century, the threat posed by Germany began to replace the Russian threat in British foreign policy. This led to a realignment of alliances, and in the First World War the UK found itself at war with the Ottoman Empire, which had allied itself with Germany. After the war, the UK played a key role in the dismemberment of the Ottoman Empire, taking control of many of its former territories in the Middle East under League of Nations 'mandates'.


== The European Balance of Power ==
== The European Balance of Power ==
[[Image:Congress of Vienna.PNG|right|thumb|200px|The Congress of Vienna by Jean Godefroy.]]
[[Image:Congress of Vienna.PNG|right|thumb|200px|The Congress of Vienna by Jean Godefroy.]]


European equilibrium was a central concept in 19th century international relations. It was a system of peacekeeping that aimed to preserve political stability in Europe by preventing any one power from dominating the others. The major powers had to undertake not to seek to extend their territory to the detriment of others and to resolve their differences peacefully. This system was put in place after the Napoleonic Wars and was maintained until the First World War, although it was put to the test by the rivalries and conflicts between the great European powers.
=== The Congress of Vienna (1815) ===
The concept of a balance of power in Europe was central to the political and strategic thinking of European states in the 19th century. This balance was intended to prevent any single country dominating the continent and disrupting the stability of the region. This reflected a reaction to the Napoleonic Wars, when Napoleon's expansionist ambitions had destabilised the continent. The Congress of Vienna, which took place in 1814-1815 after the fall of Napoleon, was a key moment in establishing this concept of a balance of power. The European powers, in particular Austria, Russia, Prussia and the United Kingdom, redrew the map of Europe in the hope of creating a balance that would discourage future wars.
 
The main aim of the Congress of Vienna, which took place from November 1814 to June 1815, was to restore political and military balance in Europe after the upheaval caused by the Napoleonic Wars. This congress was a major attempt at multilateral diplomacy and the participants sought to restore the old order after the collapse of the Napoleonic Empire. One of the main decisions taken at the congress was to contain France to prevent it from causing further unrest in Europe. France's borders were reduced to what they had been in 1790, before the wars of the French Revolution. In addition, France's neighbours were strengthened. For example, the Netherlands was enlarged by incorporating Belgium to create a more powerful Kingdom of the Netherlands. Great Britain played a key role in the Congress. It was one of the great powers that helped defeat Napoleon, and it played an important role in the negotiations. With its extensive maritime and commercial empire, Britain was a key player in maintaining the balance of power in Europe.
 
During the 19th century, various diplomatic conferences and congresses were organised to manage international tensions and conflicts. These meetings were often dominated by the major European powers, who sought to maintain a balance of power and avoid large-scale war.
 
=== The Paris Congress (1856) ===
The Congress of Paris is precisely one significant event in nineteenth-century Europe that reflected the tension and concerns about the balance of power. The Congress of Paris (1856) is a notable example of how European powers sought to regulate conflict and avoid the domination of a single power. The Crimean War was an opportunity for the European powers to curb the expansion of the Russian Empire, seen at the time as a threat to the balance of power in Europe. The Congress of Paris attempted to introduce modern principles of international law. For example, the prohibition of privateering (i.e. allowing private ships to conduct hostilities in time of war) was established in the treaty. Despite the settlement of the Crimean War, persistent tensions in the Balkans and the question of the Orient continued to threaten peace in Europe, eventually leading to further conflicts in the region.
 
The Crimean War (1853-1856) was a significant moment in the history of the 19th century, not only in terms of its impact on the balance of European power, but also because of its repercussions on the conduct of war and international relations. The war pitted Russia against a coalition of states made up of France, the United Kingdom, the Ottoman Empire and the Kingdom of Sardinia. The main issue was control of the Bosphorus and Dardanelles straits, which were essential for Russia's access to the Mediterranean Sea. This was an issue of great strategic importance, as it affected Russia's ability to project its influence and maintain its presence in the Mediterranean. After several years of fighting, the warring parties concluded peace at the Congress of Paris in 1856. In the resulting treaty, Russia was forced to relinquish its claims to the territories of the Straits as well as Moldavia and Wallachia. The treaty also established the neutrality of the straits, allowing all merchant ships through in peacetime and prohibiting warships from entering in peacetime. These provisions greatly limited Russia's influence in the region and underlined the importance of maintaining the balance of power in Europe. However, as is common in diplomatic agreements, underlying tensions and unresolved ambitions continued to exist and helped to fuel future conflicts in the region.
 
The Treaty of Paris of 1856 marked the end of the Crimean War, with several important provisions aimed at maintaining peace and stability in Europe. In addition to the conditions mentioned concerning Russia, the treaty also established several other principles and rules:
 
* The neutralisation of the Black Sea: The treaty stipulated that the Black Sea was neutral, meaning that no warships could be present there in peacetime. This provision limited Russia's influence in the region and was intended to prevent future conflicts.
* The guarantee of the territorial integrity of the Ottoman Empire: The European signatory powers agreed to respect the territorial integrity of the Ottoman Empire, with the aim of preventing the break-up of the empire and any conflicts that might ensue.
* Protection of Christians in the Ottoman Empire: The treaty also provided guarantees for the protection of Christians in the Ottoman Empire, which was a matter of concern for several European powers.
* Recognition of Romania, Serbia and Montenegro: The treaty also recognised the independence of Romania, Serbia and Montenegro, which had previously been under the control of the Ottoman Empire.
 
However, although the Treaty of Paris brought a degree of stability to Europe in the short term, the underlying tensions between the European powers and nationalist aspirations in the Ottoman Empire and elsewhere persisted, leading to further conflict in the decades that followed.
 
=== The Congress of Berlin (1878) ===
The Treaty of San Stefano, signed on 3 March 1878 at the end of the Russo-Turkish War of 1877-1878, provided for major territorial concessions from the Ottoman Empire and created an autonomous Bulgarian state under Russian influence, extending into the Balkans. The European powers, in particular Great Britain and Austria-Hungary, were concerned about the imbalance of power this would create in the region and the increased influence of Russia. Consequently, they convened the Congress of Berlin in June and July 1878 to revise the terms of the Treaty of San Stefano.
 
The Congress of Berlin led to the signing of the Treaty of Berlin, which considerably reduced the size of the Bulgarian state created by the Treaty of San Stefano and placed part of its territories under the control of the Ottoman Empire or other European powers. The treaty also recognised the complete independence of Romania, Serbia and Montenegro from the Ottoman Empire, assigned Bosnia-Herzegovina to the administration of Austria-Hungary and granted Great Britain control of Cyprus. The Congress of Berlin and the resulting treaty were important events in the history of international relations, as they reconfigured the political map of the Balkans and had a significant impact on the balance of power in Europe. However, they failed to definitively resolve nationalist tensions and power rivalries in the region, which contributed to subsequent conflicts, including the Balkan Wars and the First World War.
 
The Congress of Berlin significantly altered the political landscape of the Balkans, while seeking to maintain a certain balance of power between the various European nations. The Bulgarian state, which had been considerably enlarged by the Treaty of San Stefano, was divided into three parts by the Treaty of Berlin. Bulgaria itself became an autonomous principality under Ottoman suzerainty, eastern Rumelia obtained autonomous status under the direct control of the Ottoman Empire, and Macedonia returned to the authority of the Ottoman Empire. The Congress of Berlin also extended the territory of Serbia and Montenegro and recognised their independence, as well as that of Romania. Austria-Hungary, for its part, obtained the right to occupy and administer Bosnia-Herzegovina, even though it officially remained a province of the Ottoman Empire. These changes had long-term consequences for the Balkans and for Europe in general, exacerbating nationalist tensions and territorial conflicts, and paving the way for future crises.


The Congress of Vienna in 1815 aimed to restore European balance by limiting the influence of France and reorganising the continent after the Napoleonic Wars. The great European powers came together to redefine borders and alliances, and established the principle of the importance of maintaining a balance of power in Europe to prevent one power dominating the others. Great Britain, with its maritime and commercial empire, was seen as a key element in this balance.
=== The Algeciras Congress (1906) ===
The Congress of Algeciras was convened on the initiative of German Chancellor Bernhard von Bülow following the Tangiers crisis of 1905, when Kaiser Wilhelm II declared his support for Moroccan independence, thereby challenging France's growing control over the country. This declaration led to a serious diplomatic crisis between France and Germany. At the Algeciras Congress, the majority of participating countries supported France's position. The result was recognition of France's "freedom of action" in Morocco, while officially maintaining the Sultan's sovereignty. Germany was forced to accept a compromise that included respect for commercial freedom in Morocco, as well as the establishment of an international police force led by French and Spanish officers to maintain order. The event was a diplomatic setback for Germany and contributed to the country's international isolation. It also marked a rapprochement between France and the United Kingdom, who had already drawn closer with the Entente Cordiale of 1904, reinforcing the opposition between the Allies (France, United Kingdom, Russia) and the Central Powers (Germany, Austria-Hungary, Italy) that was to lead to the First World War.


Diplomatic Congresses and Conferences were a way for the great European powers to maintain a certain balance and settle international disputes throughout the 19th century.
The Congress of Algeciras reflected and intensified the tensions between the great powers, particularly between France and Germany. While the Congress confirmed France's privileged position in Morocco, it also formalised a system of international control, in principle intended to guarantee the economic rights of other nations and preserve Morocco's formal independence. In practice, however, the Congress mainly validated France's growing influence over Morocco, which was perceived as a setback for Germany. This fuelled resentments and tensions that ultimately contributed to the escalation of hostilities that led to the First World War. It is also important to note that the Congress of Algeciras was an early example of US involvement in European affairs, foreshadowing its growing role on the international stage during the twentieth century.
*The 1856 Congress of Paris was organised at the end of the Crimean War, which pitted Russia against a coalition formed by France, Great Britain, the Ottoman Empire and the Kingdom of Sardinia. The conflict was over control of the straits that gave Russia access to the warm seas. The European powers feared that Russia would become too powerful and threaten their equilibrium. The aim of the Congress of Paris was to resolve the problems posed by the war and restore peace. The negotiations culminated in the signing of the Treaty of Paris, which put an end to the Crimean War. Russia was forced to give up its claims to the straits and to Moldavia and Wallachia (now Romania). The treaty also established guarantees for the protection of Christians in the Ottoman Empire and recognised the neutrality of the Black Sea.
*The Congress of Berlin of 1878 was convened by the major European powers to resolve the problems arising from the Russo-Turkish War of 1877-1878 and to revise the terms of the Treaty of San Stefano, which had been imposed by Russia on the Ottoman Empire. The Congress was chaired by German Chancellor Otto von Bismarck and the European powers decided to redraw the borders of the Balkans, granting greater autonomy to certain Balkan states, notably Serbia and Romania, while strengthening the influence of Austria-Hungary in the region. The Congress of Berlin also recognised the independence of Romania, Serbia and Montenegro, while imposing limitations on the sovereignty of the newly created Bulgaria.
*The 1906 Congress of Algeciras aimed to settle a colonial dispute between France and Germany over Morocco, which was then an independent state but also the object of covetousness on the part of the major European powers. Germany was seeking to challenge France's influence over Morocco, which had led to a diplomatic crisis between the two countries. The congress was held in Algeciras, Spain, and brought together the major European powers as well as the United States. In the end, it was decided to let France manage Morocco's affairs, while guaranteeing the rights of other European nations in the country. However, this decision also reinforced the animosity between France and Germany, which contributed to the escalation of tensions in Europe before the First World War.


The European balance was upset at the beginning of the 20th century. Several factors contributed to this situation, such as the rise of nationalism and territorial claims, the arms race and the increase in tensions between the great powers. Rivalries between Germany, France and Great Britain, in particular, became increasingly pronounced, helping to weaken the balance that had been established at the Congress of Vienna in 1815.
The growing tension between the European powers at the beginning of the 20th century threatened the balance of power established at the Congress of Vienna. A major factor in this instability was the rapid rise of Germany as a major economic and military power under the leadership of Kaiser Wilhelm II and Chancellor Otto von Bismarck. Germany sought to expand its influence, which led to tensions with other great powers, particularly Britain and France. Growing nationalism in Europe also played an important role. Many populations began to claim their right to self-determination, which created tensions in regions such as the Balkans. In addition, the arms race, particularly between Germany and Great Britain, helped to create a climate of mistrust and rivalry. The development of new military technologies and the strengthening of armies have increased the potential for destruction in the event of conflict. All these factors contributed to an escalation of tensions that eventually led to the outbreak of the First World War in 1914, signifying the end of the European balance of power as conceived in 1815.


== The Emergence of the New Global Powers ==
== The Emergence of the New Global Powers ==
From the end of the 19th century, new powers emerged outside Europe, upsetting the balance of power. The United States, after its victory in the Spanish-American War in 1898, asserted its influence over the Caribbean and Latin America. Japan, for its part, established itself as the main Asian power after its victory over Russia in 1905. These new powers challenged European domination of the world and contributed to the rising international tensions that led to the First World War.
In the second half of the 19th century, the world began to experience a significant redistribution of power on a global scale. Both the United States and Japan began to emerge as influential global players.


The '''United States''', originally a neutral country limited by its thirteen colonies to the Atlantic seaboard, developed rapidly from the end of the 19th century. In the space of 50 years, it extended over 9.5 million km2 , a territory rich in natural resources, and populated extremely quickly thanks to massive immigration, increasing from 50 to 100 million inhabitants at the beginning of the 20th century. This exponential economic and demographic growth was to make the United States a major world power.
The Spanish-American War marked a key stage in the United States' rise to power on the international stage. The US victory not only led to the annexation of Puerto Rico, Guam and the Philippines, but also confirmed America's status as a colonial power. It also formalised American domination of Cuba and gave the United States significant influence over the political and economic affairs of Latin America, notably through the Monroe Doctrine, which established Latin America as a sphere of American influence.


From the beginning of the 20th century, the United States became the world's leading industrial power. In 1900, American industrial production accounted for 23% of world production, while that of Great Britain, the leading industrial power in the 19th century, only accounted for 14%. The United States experienced strong economic growth thanks to the exploitation of its natural resources (coal, oil, iron, copper, etc.), its abundant and inexpensive labour force, and its technological and organisational innovations. This growth is also reflected in their political influence and their role on the international scene.
Japan, for its part, became a major world power after its victory over Russia in the Russo-Japanese War of 1904-1905. This war marked the first time that an Asian nation had defeated a European power in a modern military conflict, and it radically changed perceptions of the balance of power in the world. Japan further strengthened its position with the annexation of Korea in 1910.


The territorial expansion of the United States from the late 19th century onwards contributed to its emergence as a world power. In addition to the colonial conquest of Cuba, the Philippines and Puerto Rico, the US also acquired new territories such as Hawaii and Alaska. Theodore Roosevelt's foreign policy, which was inspired by the maxim "Speak softly and carry a big stick", also contributed to the projection of US power on the international stage. For example, his policy of ''gunboat diplomacy'' was aimed at protecting American interests in Central and South America.
These developments upset the traditional balance of power, creating a new dynamic in international relations and contributing to the complex tensions that led to the First World War.


'''Japan''' adopted a policy of opening up to the world and rapid modernisation under the Meiji era from 1868 onwards, with the aim of catching up economically and militarily with the Western powers. In particular, the country developed modern industry, adopted Western techniques and technologies, and set up a modern army modelled on the European powers. Japan also pursued an imperialist policy in Asia, seeking to expand its territory and acquire colonies. It conquered Taiwan, Korea and part of China, as well as territories in the Pacific. This imperialist and expansionist policy led to conflicts with the European powers and the United States, notably during the Russo-Japanese War of 1904-1905 and the Second World War.
=== The United States ===
The evolution of the United States between the end of the 18th century and the beginning of the 20th century is remarkable. The country went from being an isolated young nation to a world power. The great territorial expansion of the United States began in the early 19th century with the doctrine of "Manifest Destiny", a widely held belief that the United States was destined to expand across the North American continent. This ideology led to a series of territorial acquisitions, perhaps most notably the purchase of Louisiana from France in 1803, which doubled the size of the country. Other important territorial acquisitions include the purchase of Alaska from Russia in 1867 and the annexation of the Republic of Texas in 1845. At the same time as this territorial expansion, the United States experienced impressive demographic growth. Much of this population growth was due to immigration, with millions of people coming from Europe and elsewhere in search of a better life. Waves of immigration have also contributed to the diversity and vitality of American culture. Finally, the late nineteenth century ushered in the era of the 'Industrial Revolution', a period of rapid economic growth and technological innovation. The United States became a world leader in fields such as steel, oil and electricity, and major companies such as Standard Oil and Carnegie Steel dominated their respective sectors. All these factors, combined with a stable political system and a strong entrepreneurial spirit, enabled the United States to become a major global economic and military power at the dawn of the 20th century.


Japan embarked on an extensive modernisation programme, called the Meiji Restoration, which transformed its economy, administration and military system. The country opened up to trade with the West and adopted modern technologies and practices, while preserving its cultural traditions. Japan rapidly industrialised and became a major regional economic power in Asia. Its navy was modernised and it began to expand its influence in Asia, notably by conquering Taiwan and Korea. Indeed, in 1894, China and Japan fought a war for control of Korea. Japan quickly gained the upper hand through modernisation and military superiority, winning decisive victories on land and at sea. The war ended with the Treaty of Shimonoseki in April 1895, in which China ceded Taiwan, the Pescadores Islands and the Liaodong Peninsula to Japan, as well as recognising Korea's independence. This victory reinforced Japan's status as a regional power and contributed to the weakening of Chinese influence in East Asia. In 1905, Japan also won a decisive victory against Russia in the Russo-Japanese War, establishing its reputation as a military power. The Russo-Japanese War of 1904-1905 was a major conflict between the Russian Empire and the Japanese Empire for control of Korea and Manchuria. Japan launched a surprise attack on the Russian fleet at Port Arthur in February 1904, which triggered the conflict. The Japanese won several decisive victories, including the Battle of Mukden and the naval battle of Tsushima. In September 1905, the two countries signed the Treaty of Portsmouth, which ended the war and gave Japan sovereignty over Korea and part of Manchuria. Japan's victory came as a surprise to many European powers, as it showed that Asian countries could compete with the great European powers militarily and politically.
The rapid economic growth of the United States in the early 20th century was fuelled by a combination of factors, including the exploitation of vast natural resources, a large and increasingly skilled workforce, and major technological advances. The rapid industrialisation of the United States was supported by an abundance of natural resources, including coal, oil and various minerals, which provided the raw materials needed to fuel factories and machinery. In addition, a growing workforce - largely through immigration - provided the manpower to keep these industries running. The United States has also benefited from major technological and organisational advances. For example, Henry Ford's introduction of in-line assembly in the car industry revolutionised the manufacturing process and enabled goods to be produced more efficiently and at lower cost. As a result of this economic growth, the United States also gained in political influence. After the First World War, it became a major player on the international stage, playing a leading role in the formation of new international institutions such as the League of Nations, although it ultimately chose not to become a member. This influence grew even stronger after the Second World War, when the United States became one of the world's two superpowers, alongside the Soviet Union.


At the end of the 19th century, the United States and Japan emerged as important economic and military powers outside Europe. The United States became the world's leading industrial power, while Japan rapidly modernised to become an important regional power. These new powers began to challenge the European balance, especially as Europe itself was facing increasing tensions between the various European powers.
The territorial expansion of the United States was a major factor in its rise as a world power in the late nineteenth and early twentieth centuries:
* Alaska: The United States bought Alaska from Russia in 1867 for $7.2 million. This transaction, often referred to as "Seward's folly" after the Secretary of State William H. Seward who orchestrated it, added 1.5 million km² of territory to the United States. Alaska became the 49th US state in 1959.
* Hawaii: The Hawaiian Islands became a territory of the United States in 1898, following the revolution of 1893 that overthrew Queen Lili'uokalani. Hawaii was annexed mainly for economic and strategic reasons. It became the 50th state of the United States in 1959.
* Cuba, the Philippines and Puerto Rico: These territories were ceded to the United States by Spain at the end of the Spanish-American War in 1898 under the Treaty of Paris. However, Cuba was granted independence in 1902, although the United States retained certain rights of intervention and control of Guantanamo Bay. The Philippines gained independence in 1946, after the Second World War. Puerto Rico remained an unincorporated territory of the United States.
 
The foreign policy of President Theodore Roosevelt, who was in office from 1901 to 1909, played a key role in this development. His maxim, "Speak softly and carry a big stick", captures his foreign policy, often referred to as the "big stick policy". Roosevelt believed in peaceful engagement with other nations, but was prepared to use force, if necessary, to protect US interests. As part of this policy, Roosevelt worked to strengthen the US military presence, notably by sending the "Great White Fleet" on a world tour from 1907 to 1909 to demonstrate US naval power. He also used this approach in his management of the Panama Canal, the construction of which was a major achievement of his administration.
 
The territorial expansion of the United States at the end of the 19th century greatly contributed to its transformation into a world power. The acquisition of new territories and resources boosted the American economy, and the construction of naval bases in these territories extended the country's military reach. The aggressive foreign policies of presidents like Theodore Roosevelt also played an important role. Roosevelt, for example, supported the construction of the Panama Canal, which improved the United States' ability to project its naval power around the world. In addition, technological innovation and rapid industrialisation made the United States the world leader in industrial production in the early 20th century. These factors, combined with a rapidly growing population, gave the United States the means to exert its influence on a global scale. It is important to note that this rise to power was also accompanied by tensions and conflicts, both domestically and internationally. Ultimately, however, these developments laid the foundations for the United States' status as a superpower in the 20th century.
 
=== Japan ===
The Meiji era (1868-1912) in Japan was a period of profound and rapid transformation. Isolated for more than two centuries under the Tokugawa shogunate's policy of sakoku (national isolation), Japan was forced to open up to the outside world following the arrival of Commodore Matthew Perry's black ships from the United States in 1853. The Meiji Restoration in 1868 marked the start of a rapid process of modernisation and westernisation. The new government launched numerous reforms to modernise the country along Western lines, including the construction of modern infrastructure, the adoption of new technologies, the introduction of a universal education system, and the reorganisation of the army and navy along Western lines. These reforms transformed Japan from a feudal country into a modern industrial and military power in the space of a few decades. This enabled Japan to become the first non-Western power to defeat a modern Western power in the Russo-Japanese War of 1904-1905. This victory established Japan as a world power and changed the balance of power in East Asia.
 
In the late nineteenth and early twentieth centuries, Japan adopted an aggressive expansionist policy in East Asia and the Pacific. After the First Sino-Japanese War (1894-1895), Japan acquired Taiwan and the Pescadores Islands. Japan's victory over Russia in the Russo-Japanese War (1904-1905) not only established Japan as a world power, but also gave it control of Korea and certain territories in Manchuria. In 1910, Japan officially annexed Korea, which remained a Japanese colony until the end of the Second World War in 1945. During the First World War, Japan seized the opportunity to extend its influence in China and the Pacific. After the attack on Pearl Harbor in 1941 and for much of the Second World War, Japan controlled a vast empire that stretched across much of East Asia and the Pacific.
 
The Meiji Restoration, which began in 1868, marked a period of rapid modernisation and industrialisation in Japan. It was a time of great change, as the country moved from an isolated feudal system to a modern structure of governance and economy. These changes had a significant impact on Japan's position in the world. During this period, Japan also began to establish a colonial empire. The Sino-Japanese War of 1894-1895 marked an important stage in this expansion. Japan's victory and the resulting Treaty of Shimonoseki considerably increased Japan's influence in East Asia. Taiwan became a Japanese colony and Korea's independence was recognised, paving the way for increased Japanese influence and domination in the decades that followed. Japan's rapid modernisation, combined with its imperialist ambitions, saw the country rise to great power status in the late nineteenth and early twentieth centuries.
 
The Russo-Japanese War was a turning point not only in the history of Japan, but also in that of the world, challenging the unchallenged dominance of the European powers. Thanks to its rapid and effective modernisation, Japan was able to inflict a series of surprising defeats on Russia. Particularly significant was the decisive victory at the Battle of Tsushima, where the Russian fleet was virtually wiped out. The subsequent Treaty of Portsmouth recognised Japan's territorial gains in Korea and Manchuria. It marked the beginning of a new era in international relations, in which a non-European nation was able to take its place among the great powers. It also stimulated Japanese nationalism and strengthened Japan's position as a colonial power in Asia. However, it also sowed the seeds of future conflict, particularly with the United States, as a result of the expansion of Japanese influence in East Asia.
 
These developments in the early twentieth century marked the beginning of a profound shift in the global balance of power. While Europe was still at the centre of world affairs, the rise of the United States and Japan began to challenge this dominance. The United States, with its vast territory, growing population and ability to adopt and innovate in industrial technology, was able to surpass the European powers in many economic areas. Their influence was not limited to the economy: they also intervened significantly in the political affairs of Latin America and began to assert themselves as a major naval power. As for Japan, its rapid modernisation and victory over Russia not only transformed the country into a major regional power, but also challenged the conventional wisdom that European powers were militarily superior. This not only enhanced Japan's international status, but also set an example for other non-Western countries seeking to modernise. The rise of these two powers was one of many factors contributing to the growing instability in the run-up to the First World War, a period marked by increased tensions and rivalries between the great powers.


= The Era of Colonial Expansion =
= The Era of Colonial Expansion =


The 19th century was marked by a significant increase in the size of colonial empires, particularly those of the European powers. In 1800, these empires controlled about 35% of the earth's surface, but this figure had risen to 85% by 1914. Colonial conquest was one of the major phenomena of the 19th century. Almost all European powers embarked on this enterprise, and the consequences were considerable.  
The 19th century saw a significant increase in the size of colonial empires, particularly those of the European powers. In 1800, these empires controlled around 35% of the earth's surface, but this figure had risen to 85% by 1914. Colonial conquest was one of the major phenomena of the 19th century. Almost all the European powers embarked on this venture, and the consequences were considerable. The 19th century saw unprecedented colonial expansion, often referred to as the "New Imperialism". This phenomenon was largely driven by economic, political and strategic factors. Economically, the Industrial Revolution increased the demand of European powers for cheap raw materials and markets for their manufactured goods. The colonies offered not only valuable natural resources, but also captive markets for goods produced in Europe. Politically and strategically, the possession of vast colonial empires was seen as a sign of prestige and power. Rivalry between European powers often led to races to acquire and consolidate colonies, with each seeking to outdo the others. This often led to tension and conflict, including the Boer War in South Africa and the Fashoda Crisis in East Africa.  


In the 19th century, the European powers undertook a major colonial expansion. This conquest of new territories allowed European countries to appropriate natural resources, to extend their cultural and economic influence, and to establish their power on the international scene. The British Empire was the largest of all, covering almost 33 million km² at its peak, including India, South Africa, Australia and Canada. France also expanded its colonial empire, notably in West Africa and Indochina. Germany established colonies in Africa and Asia, but to a lesser extent than the previous two powers. Other European countries, such as Belgium, the Netherlands, Spain, Portugal, Italy and Russia, also established colonies in different parts of the world. However, the end of the 19th century saw the emergence of new colonial powers, such as the United States and Japan, which also began to extend their influence outside their national territory.  
At that time, imperialism and colonialism were major elements of the foreign policy of many world powers. The prevailing idea was that the most powerful nations had the right, indeed the duty, to extend their influence and control over weaker territories. This belief was often underpinned by notions of racial or cultural superiority, as well as a desire for economic gain. The British Empire, one of the largest in history, developed a complex administration to govern its many colonies. Britain also introduced many aspects of its culture and institutions into the territories it controlled, effects that persist to this day. Similarly, France established a vast colonial empire, particularly in Africa, where it imposed its language and culture. The natural resources of these colonies were exploited for the benefit of the metropolis. Germany, which was a more recent state in Europe, established several colonies in Africa and the Pacific, although its colonial empire was less extensive than those of France or Great Britain. Outside Europe, the United States and Japan became colonial powers in the late nineteenth and early twentieth centuries. The United States acquired territories such as the Philippines and Puerto Rico following the Spanish-American War, while Japan established an empire in East Asia, including Taiwan, Korea and parts of China.


Imperialism is not only an economic rationale for seeking new markets and sources of raw materials. It is also motivated by political, strategic and symbolic aspirations. European states seek to extend their influence in the world in order to assert their power and prestige on the international scene, but also to satisfy public opinion and strengthen their national cohesion. In this context, the possession of colonies and territorial expansion were perceived as signs of greatness and superiority, and served to justify imperial policies to public opinion. This was particularly the case for Germany, which, as a recent and belatedly unified state, had to assert its place on the international scene by establishing itself in colonial areas and building a powerful war fleet.
Imperialism and colonialism are motivated not only by economic objectives, but also by political, strategic and symbolic aspirations. Politically and strategically, control of additional territories provided imperialist nations with additional military bases, trade routes and a greater ability to project their power on a global scale. Colonies could also act as buffers between the metropolis and potential enemies. On a symbolic level, owning colonies was often seen as a mark of greatness and prestige for a nation. It served to reinforce national sentiment and justify the political regime in power, by arguing that it was capable of obtaining and maintaining overseas colonies. The example of Germany is very relevant. As a recently unified country, Germany felt the need to demonstrate its power and legitimacy on the international stage. This led to a race to colonise and militarise, particularly in terms of building a powerful war fleet to rival that of Great Britain.


Colonial expansion was often used as a tool to strengthen nationalism in European countries. Colonial powers presented colonisation as a means of extending the influence of their nation, culture and civilisation around the world, and this generated enthusiasm and support among citizens in their own countries. Colonial conquests also allowed European countries to compete with each other for territory and wealth, creating a sense of national competition that reinforced nationalist movements.
Colonisation was a major driver of nationalism in the colonising countries, partly because it reinforced a sense of national superiority and created a sense of common identity based on the domination of other peoples. The acquisition of foreign territories and resources was often presented as proof of a nation's greatness and power. In addition, colonisation created a sense of international competition between European powers, with each country seeking to outdo the others in terms of the number of colonies and territorial extent. It also fuelled nationalist sentiment, as citizens felt engaged in a global struggle for national supremacy. Finally, colonisation was often used to divert attention from domestic problems. For example, if a government faced social or economic unrest at home, it could launch a colonial campaign to divert public attention and create a sense of national unity. While colonisation strengthened nationalism in the colonising countries, it also sowed the seeds of nationalist movements among the colonised peoples. Faced with colonial oppression, many colonised peoples began to develop their own sense of national identity and to fight for independence.


== The Establishment of Colonial Empires ==
== The Establishment of Colonial Empires==


Colonisation often involved the territorial expansion of imperial states, which sought to establish their dominance over distant territories often populated by indigenous peoples. This domination was expressed through the establishment of political, economic and social regimes imposed by the metropolis, which sought to exploit the resources of the colonial territory for the benefit of its national economy. This situation of subjugation had important repercussions on the colonised populations, who suffered discrimination and deprivation of freedom, and who often opposed colonial domination.
=== The colonial empires ===
Colonisation has had devastating consequences for indigenous populations. In general, the colonisers sought to impose their own political, economic, social and cultural systems on the indigenous populations, often using force and repression. Indigenous cultures and languages were often suppressed, and colonised peoples were forced to adopt the colonisers' ways of life and beliefs. In addition, the natural resources of the colonies were exploited for the benefit of the economies of the colonising countries, often without regard to the needs or rights of the indigenous populations. Indigenous populations were often forced to work in extremely harsh conditions and exploited to extract these resources. Colonisation has also often led to deep and lasting inequalities. The colonisers generally established systems of segregation and discrimination, where indigenous people were considered inferior and deprived of many fundamental rights.


Colonial empires are primarily territories to be exploited for the almost exclusive benefit of the metropolis. For many colonial empires, the colonising powers sought above all to exploit the natural resources of the colonised territories for their own economic benefit. For example, France exploited the mineral resources of Indochina and Africa, while Britain focused on the exploitation of raw materials in India and Africa. The Congo was an example of brutal colonial exploitation, particularly under the personal rule of King Leopold II of Belgium, who had made it his private property called the Independent State of Congo. The Congo was exploited for its natural resources, such as ivory and rubber, through forced labour, including the use of violence and mutilation. This exploitation had disastrous consequences for the local population, resulting in massive loss of life and suffering. Colonised peoples were often forced to work in harsh and exploitative conditions without adequate remuneration, creating economic and social inequalities between the metropolis and the colonies.
Natural resources were one of the main motivations for colonisation. The main objective of colonising countries was often to exploit the natural resources of the colonies to fuel their own economies. This could include resources such as gold and other precious metals, diamonds, rubber, spices, timber, tea, coffee, cotton and many others. To maximise the exploitation of these resources, colonising countries often set up administrative and labour systems that were extremely exploitative and oppressive for the local populations. These systems often included forced labour, land confiscation, taxation and other forms of economic exploitation.


In the 19th century, seven European powers shared the world, but not equally. Britain, France, Germany, Spain, Portugal, Belgium and Italy were the major colonial powers. Britain and France far outnumber the others in terms of area and population colonised.
King Leopold II of Belgium is known to have instituted a particularly brutal and exploitative regime in the independent state of Congo, which was his personal property and not a colony of Belgium. Leopold's regime forced the local population to harvest wild rubber under extremely difficult conditions. Those who failed to meet the quotas were often punished by mutilation or death. It is estimated that millions of people died as a result of the brutal working conditions and diseases associated with forced labour. In Indochina and Africa, France also exploited natural resources, including coal, copper, rubber and timber. Forced labour systems were also established, and local populations were often forced to work in extremely difficult conditions. Great Britain, for its part, heavily exploited the resources of India and its African colonies. In India, the cotton industry and tea plantations were among the main sectors exploited by the British.


[[File:Colonisation 1914.png|thumb|center|500px|The colonised world in 1914.]]
Britain and France were the two greatest colonial powers of the 19th century in terms of the size and population of their respective empires.


The British Empire was the largest in the world at its peak, covering about 25% of the world's landmass and stretching across every part of the globe, including India, Africa, Australia and New Zealand, as well as colonies in North America and South East Asia. The British Empire was so extensive that it was said that "the sun never set on its possessions", due to the British presence on almost every continent in the world. The British Empire spans almost every part of the globe and comprises colonies, protectorates and dominions. The British Empire includes many colonies and protectorates on several continents, such as India, Nigeria, Egypt, Sudan and Rhodesia. It also includes dominions, settlements to which English and Irish settlers have migrated in large numbers and enjoy a degree of internal political autonomy. The dominions of the British Empire include Canada, Australia, New Zealand and South Africa. In the latter, which are settlements, English and Irish people emigrated to populate sparsely populated lands. However, in the colonies and protectorates there was not as large an English presence as in the dominions. By the mid-19th century, the British dominions had evolved into self-governing systems, while remaining within the realm of the kingdom. The dominions had significant internal autonomy in governance, but in terms of foreign and defence policy they were tied to Britain. This is known as the "One Empire, One Foreign Policy" principle of the British Empire. However, the dominions can express themselves on the international stage through their participation in imperial conferences, where the various colonies and dominions discuss issues of common interest. This principle was reinforced by the Balfour Declaration of 1926, which established the equal status of Britain and its dominions in foreign policy matters. The possession of small islands was considered important to colonial empires because of their strategic utility. Islands could be used as naval bases, staging points for food and fuel supply to ships, or as transit points for goods. They could also provide natural resources such as mines or plantations. Colonial empires therefore competed for the possession of these islands, especially in the Pacific and Indian Oceans.  
The British Empire, often described as "the empire on which the sun never sets", was the largest. It spanned every continent, including territories as diverse as India, Australia, Canada, various parts of Africa, as well as many territories in the Caribbean and the Pacific.


The ''French Empire'' was the second largest empire in terms of area, after the British Empire. Unlike the British Empire, the French Empire was mainly centred on Africa and Asia, with colonies in Indochina, West and East Africa, Algeria and French Polynesia. France also exerted influence over independent states such as Morocco, Tunisia and Cambodia. The French Empire extended over vast territories in Africa and Asia, but was less extensive than the British Empire. Algeria was the only French colony to have the status of a department, which meant that it was an integral part of French territory. Other colonies and protectorates included territories such as Senegal, Mauritania, Tunisia, Morocco and Indochina.
The French Empire, although not as large as the British Empire, was also extensive and included territories in North Africa (notably Algeria, Tunisia and Morocco), sub-Saharan Africa (French West Africa and French Equatorial Africa), Asia (notably Indochina), as well as America and the Pacific.


The ''Dutch Empire'', also known as the Dutch East Indies, consisted of numerous colonies and trading posts in various parts of the world, including Asia, Africa and the Americas. The most important colonies were in Indonesia, where the Dutch established a brutal colonial system that lasted for more than three centuries. Dutch Guiana (now Suriname) was also part of the Dutch Empire until its independence in 1975.
Germany, Italy and Belgium were newcomers to the colonisation race and had smaller colonial empires. The German colonial empire included territories in Africa (Togo, Cameroon, South West Africa, East Africa) and the Pacific. Italy had colonies in Africa (Eritrea, Italian Somalia, Libya). Belgium, although small, controlled the enormous and richly endowed Congo.


The Belgian Empire was mainly centred on the colony of Congo, which covered an area of over 2.3 million km² in Central Africa. The Congo was intensively exploited for its natural resources such as rubber and ivory, which had disastrous consequences for the Congolese population, who suffered atrocities committed by the Belgian colonisers. The colony of Congo finally gained its independence in 1960.
Spain and Portugal, which had been leaders in exploration and colonisation in the 15th and 16th centuries, had smaller empires by the 19th century. Spain still controlled territories in Africa (Western Sahara, Equatorial Guinea) and the Pacific, while Portugal had colonies in Africa (Angola, Mozambique, Guinea-Bissau) and Asia (East Timor, Goa).


The Portuguese Empire also held colonies in Asia (such as Macao in China and Goa in India) and in South America (Brazil). In Africa, Portugal held colonies in the region of Angola and Mozambique, as well as smaller territories such as Sao Tome and Principe and Portuguese Guinea.
It should also be noted that Russia, although not generally considered a colonial power in the classical sense of the term, also underwent significant territorial expansion in the 19th century, particularly in Asia.[[File:Colonisation 1914.png|thumb|center|500px|The colonised world in 1914.]]


The Italian Empire conquered these three African territories during the Scramble for Africa, a period of intensive colonisation of Africa by European powers in the late 19th century. Eritrea was conquered in 1890, Somalia in 1908 and Libya in 1911. However, the Italian Empire lost its African colonies after the Second World War.
=== The British Empire ===
The British Empire was the largest in the world at its height, covering around 25% of the landmass and stretching across every part of the globe. The British Empire was truly a global empire, with territories on every continent. For more details:


Russia expanded its territory eastward and southward, annexing lands in Central Asia and the Caucasus during the 19th century. This expansion was led by the Russian army and brought Russia closer to the Chinese border and the Black Sea. Chechnya, which was annexed in 1859, became a point of tension between the Russian authorities and Chechen separatists. In 1867, Russia sold Alaska to the United States, a decision that was criticised by some Russians at the time, but which proved beneficial to the US in terms of natural wealth.
* In Asia, the British Empire controlled territories such as India (the "jewel in the crown"), modern-day Pakistan, Bangladesh, Malaysia, Singapore and Burma. India was particularly valuable to the Empire because of its wealth and population.
* In Africa, the British Empire controlled vast territories, including Egypt, Sudan, Kenya, Uganda, Zambia, Zimbabwe, South Africa and many others.
* In North America, even after losing the colonies that would become the United States, the British Empire retained Canada. The British also controlled territories in the Caribbean, such as Jamaica, the Bahamas and other islands.
* In Oceania, Australia and New Zealand were under British control, as were several Pacific islands.
* Even in Europe, the British controlled territories such as Malta and Cyprus, as well as strategic areas such as Gibraltar.


Japan and the United States should be added as colonial empires because both countries were also involved in territorial expansion outside their own territory. Although Japan and the United States are located outside Europe, they also established colonies and protectorates in other parts of the world, such as the Philippines, Guam and Puerto Rico for the United States, and Korea and Taiwan for Japan. These territories were often acquired by force and administered as colonies, with political and economic control exercised by the colonising power.
This vast empire enabled Britain to become a global superpower, with considerable cultural, economic, political and military influence.


Japan sought to modernise rapidly to avoid the colonisation of its territory by European powers that had established areas of influence in Asia. In this context, Japan carried out a series of economic, political and social reforms known as the Meiji Restoration from 1868. This modernisation allowed Japan to build a modern army and navy, which facilitated the conquest of new territories. Japan began its imperialist policy with the annexation of the island of Taiwan in 1895 following the victory in the Sino-Japanese war. Subsequently, Japan acquired new colonies in Asia, including Korea in 1910, as well as territories in the Pacific and China during the Second World War. After the Russo-Japanese War in 1905, Japan acquired several territories, including the Liaodong Peninsula in China, Sakhalin Island and part of the Kuril Islands. In 1910, Japan annexed Korea, ending the Joseon Dynasty and establishing a colonial government. In the 1930s, Japan expanded its sphere of influence in Asia, including China, Indochina and the Pacific Islands, at the expense of European colonies.
The British Empire was made up of a variety of different territories, some of which were settlements, others exploitative colonies, and still others protectorates or mandates.  


The ''United States'' was formed in reaction to British colonial rule and led an anti-colonial revolution to gain independence. However, in the late 19th century, a strong debate emerged in the United States about its role in the world and the possibility of becoming a colonial power. The war against Spain in 1898 was a turning point in this issue, as it led to the conquest of several territories that became part of the American empire. This territorial expansion was controversial in the United States, with some seeing it as a violation of the nation's democratic and anti-colonial principles, while others supported it as a manifestation of American power and prestige. Puerto Rico, Cuba, the Philippines and some islands became part of the new US empire. By the end of 1890, the US would also hold Hawaii and Alaska. From the beginning of the 20th century, the United States gradually turned away from colonial expansion to focus on its economic development and political influence around the world. It used its economic power to expand its influence and presence through trade agreements, foreign investment and international alliances. Although they retained some of their territorial possessions, notably Puerto Rico and the US Virgin Islands, their colonial empire was largely abandoned in favour of an economic and political superpower role.
* Settlements were generally territories where the British settled in large numbers, often because they were originally sparsely populated. These colonies often enjoyed a degree of political autonomy and were called dominions. Canada, Australia, New Zealand and South Africa were examples of such dominions.
* Exploitation colonies were territories that the British controlled primarily for their economic resources. These colonies were usually ruled by a governor appointed by the British monarch and often had a large indigenous population that was subject to British rule. Examples of such colonies include India, Burma, Nigeria and Sudan.
* Protectorates and mandates were territories that were not officially colonised by the British, but were under their protection or control. For example, Egypt and Sudan were protectorates, while Palestine and Transjordan were mandates conferred on Britain by the League of Nations after the First World War.


The Great Depression had a major economic impact on the colonial empires. Indeed, the colonial metropolises saw their economies weakened, which had an impact on their ability to maintain their domination over their colonies. In addition, the crisis provoked a rise in nationalism in the colonised countries, which began to demand their independence.
Each type of territory had a different status, and British laws and policies varied according to that status. However, in all these territories, the British exercised a degree of control and influence, whether through direct government, military protection or economic control.


In an attempt to revive their economies, some colonial metropolises adopted a policy of economic protectionism, creating 'preferential markets' between the colonies and the metropolis. The aim of this policy was to favour trade between the metropolis and the colonies, to the detriment of trade with other countries. This policy helped to reinforce the economic exploitation of the colonies by the metropoles, but failed to prevent the rise of the independence movement.
The dominions of the British Empire gained greater autonomy during the nineteenth and early twentieth centuries, while remaining formally linked to Great Britain. This status enabled them to manage their own internal affairs while coordinating their foreign and defence policies with those of Great Britain. The Balfour Declaration of 1926 was a decisive moment in this development. It declared that the United Kingdom and its dominions were "equal in status, not subordinate to each other in any aspect of their internal or external affairs, though united by a common allegiance to the Crown, and freely associated as members of the British Commonwealth of Nations". This consolidated the principle that the Dominions were autonomous entities within the Empire, rather than subordinate possessions of Great Britain. Nevertheless, despite this formal declaration of equality, it remained true that the United Kingdom had a dominant influence over the foreign and defence policy of the Dominions, particularly until the Second World War. This was particularly evident in the First World War, when the Dominions were drawn into the conflict largely because of their link with Britain, although some Dominions such as Canada and Australia had a degree of autonomy in managing their war effort.  


The notion of a 'civilising mission' was often used to justify colonial expansion, particularly in Europe. Colonial powers claimed to bring civilisation and progress to peoples deemed 'backward' or 'primitive'. However, this justification was often used to disguise the real motivations for colonial expansion, which were the search for wealth, power and influence.
Small islands were often of disproportionate strategic importance to colonial empires. Their usefulness as naval bases, supply stations or trading posts has often outweighed their size or population. The Pacific Ocean is a good example of this dynamic. Many colonial empires established colonies or protectorates on Pacific islands to serve as staging posts for ships bound for Asia or Australia. For example, the British Empire established colonies in Fiji and the Gilbert and Ellice Islands (now Kiribati and Tuvalu), while France established a protectorate over Tahiti and other islands in French Polynesia. The Indian Ocean also saw similar competition for strategic islands. The British Empire took control of Mauritius and the Seychelles, which were key naval bases on the route to India, while France established control over Reunion Island and Madagascar. In addition, some islands may have had valuable natural resources that were attractive to colonial empires. For example, the islands of the South Pacific were often rich in phosphate, an important resource for the fertiliser industry, while the islands of the Caribbean and the Indian Ocean had a climate conducive to the cultivation of products such as sugar, coffee and spices.


The colonisers often had little regard for the cultures and traditions of the colonised peoples, whom they sought to impose their own economic, social and political model. The consequences of this domination can still be felt today, with artificial borders and internal conflicts in many countries that have emerged from decolonisation.
=== The French Empire ===
At the height of its expansion, the French Empire was the second largest colonial empire in the world in terms of surface area, after the British Empire. At its peak in the early 20th century, it covered around 11.5 million square kilometres, or almost 8.7% of the planet's land surface.
 
The empire spanned several continents, including large tracts of land in Africa, as well as possessions in Asia, America and the Pacific Ocean. In Africa, France controlled vast territories such as Algeria, Tunisia, Morocco, Mauritania, Mali, Niger, Chad, Senegal, Côte d'Ivoire and many others. In Asia, it possessed what we now call Vietnam, Laos and Cambodia, which were collectively known as French Indochina. In the Americas, France controlled Guadeloupe, Martinique, French Guiana and Saint-Pierre-et-Miquelon. The French Empire was culturally and linguistically diverse, with populations ranging from the Berbers of the Maghreb and the Vietnamese of Indochina to the Peuls and Wolofs of West Africa. However, this empire was also marked by strong tensions and conflicts, and many of its former colonies fought for their independence during the twentieth century.
 
The French Empire had a significant presence in Africa and Asia, with vast territories colonised in these regions. In Africa, French possessions stretched across the continent, including territories such as Algeria, Morocco, Tunisia, Senegal, Mali, Niger, Chad, Côte d'Ivoire, Gabon, Central African Republic, Congo, Djibouti and Madagascar, to name but a few. In Asia, French Indochina was a collection of territories including what is now Vietnam, Laos and Cambodia. France also maintained a presence in West Asia, with the mandate of Syria and Lebanon after the First World War. Finally, the French Empire also had colonies in the Pacific, notably New Caledonia and French Polynesia. The empire was therefore truly global, stretching across several continents and regions of the world.
 
In North Africa, Algeria was seen as an extension of France itself rather than a colony, a feature reflected in its designation as a French department. This meant that, unlike the traditional French colonies, Algeria was subject to the same laws as metropolitan France, although Muslim Algerians were institutionally discriminated against and did not enjoy the same rights as French citizens until the end of the Algerian War of Independence. France also had a significant influence on formally independent states such as Morocco and Tunisia through the protectorate system. Although these countries retained their own monarchs, France controlled their foreign policy and domestic administration. In South-East Asia, French Indochina included Vietnam, Laos and Cambodia, which were administered as colonies or protectorates. These regions were governed by French representatives, who imposed economic and social policies according to French interests. Other French colonies in Africa, such as Senegal, Mauritania, Mali, Niger and others, were also administered directly by France and were used for their natural resources and as markets for French goods.
 
=== The Dutch Empire ===
The Dutch Empire was an important colonial power, particularly during the 17th and 18th centuries, although its influence began to decline at the end of the 19th century.
 
Indonesia, then known as the Dutch East Indies, was the largest and most profitable colony for the Dutch. It comprised much of what is now Indonesia, including key areas such as Java, Sumatra and the Sunda Islands. The Dutch intensively exploited the resources of these islands, including spices, rubber, tin and oil. In addition to Indonesia, the Dutch also controlled various other territories. They maintained trading posts and colonies in other parts of Asia, notably Ceylon (now Sri Lanka) and Malacca. However, many of these possessions were lost to the British during the 18th and early 19th centuries. In America, New Amsterdam (now New York) was originally a Dutch colony, but was ceded to England in 1664. However, the Dutch maintained colonies in the Caribbean, notably Aruba, Bonaire and Curaçao, as well as Suriname in South America, which they retained until the 20th century. In Africa, the Dutch established a colony at the Cape of Good Hope (now in South Africa) in the 17th century, but it was conquered by the British in the 19th century. The Dutch also controlled territories on the west coast of Africa, such as present-day Ghana, where they established forts to support the slave trade, but these territories were sold to the British in the 19th century.
 
Indonesia, then known as the Dutch East Indies, was the Netherlands' most valuable colonial possession. It was administered by the Dutch East India Company (VOC) from the 17th century until the early 19th century, and then by the Dutch government itself. The Dutch colonial system in Indonesia was characterised by economic exploitation, political oppression and social inequality. The Dutch exploited the archipelago's rich natural resources, including spices, rubber, tin and oil, for the benefit of the metropolis. They also introduced a system of forced labour, known as the "cultuurstelsel" (cultivation system), which forced Indonesian peasants to grow export crops to the detriment of their own food crops. Politically, the Dutch maintained a strict colonial regime and suppressed any form of Indonesian resistance or nationalism. This created a profound social inequality, with a Dutch colonial elite at the top of the hierarchy and the majority of the Indonesian population living in poverty and destitution. This colonial system lasted until the Second World War, when Indonesia was occupied by Japan. After the war, Indonesia declared independence in 1945, but the Dutch tried to regain control by force. A war of independence ensued, which lasted until 1949, when the Dutch finally recognised Indonesia's independence.
 
Suriname, formerly known as Dutch Guiana, was a colony of the Netherlands for more than three centuries. Located in South America, it is bordered by Guyana to the west, Brazil to the south and east, and the Atlantic Ocean to the north. The colony's economy was largely based on agriculture, with sugar cane, coffee, cocoa and cotton plantations run by African slaves. The abolition of slavery in 1863 led to the importation of contract workers from India, Indonesia and China, helping to make Suriname a multi-ethnic and multicultural society. Suriname became an autonomous country of the Kingdom of the Netherlands in 1954, before becoming fully independent in 1975. Today, although Suriname is independent, historical links with the Netherlands remain strong, with a large Surinamese diaspora living in the Netherlands and Dutch as the country's official language.
 
=== The Belgian Empire ===
The independent state of Congo, now known as the Democratic Republic of Congo, was administered by King Leopold II of Belgium as his personal property from 1885 to 1908. Leopold was able to convince the other European powers to grant him control of the Congo at the Berlin Conference of 1884-1885, claiming that he wanted to promote civilisation and the eradication of slavery in the region. However, the reality was very different. The regime of Leopold II put in place a brutal system of economic exploitation, particularly of the rubber harvest. The people of the Congo were subjected to forced labour, and often mutilated or killed if they failed to meet the production quotas set. It is estimated that several million people died as a result of Leopold's exploitation of the Congo. In 1908, under international pressure following revelations of abuses committed in the Congo, the Belgian government took control of the territory, which became the Belgian Congo. Although some of the most brutal practices were abolished, Belgium continued to govern the Congo as a colony until its independence in 1960. The legacy of this period continues to have a profound impact on the Democratic Republic of Congo today.
 
Belgian Congo gained independence on 30 June 1960, becoming the Republic of Congo, also known as Congo-Léopoldville to distinguish it from neighbouring French Congo, now the Republic of Congo or Congo-Brazzaville. The transition to independence was marked by tension and conflict. The Congo had not been prepared for autonomy by the Belgian colonial authorities, who had not expected independence so quickly and had not planned accordingly. So, at the time of independence, there were very few Congolese trained to run the country's political and administrative institutions. After independence, the Congo was plunged into a series of political crises and conflicts, including the secession of the rich mining province of Katanga, the assassination of Prime Minister Patrice Lumumba, and the seizure of power by army commander Joseph Mobutu. Mobutu reigned as dictator for more than three decades, until he was overthrown in 1997. The country was then renamed the Democratic Republic of Congo.
 
=== The Portuguese Empire ===
The Portuguese colonial empire was one of the most enduring, beginning in the 15th century with the discovery of West Africa by Prince Henry the Navigator, and extending into the 20th century. In Asia, the Portuguese established trading posts in Goa, Diu and Daman in India, Malacca in Malaysia and Macao in China. These colonies were important centres for the trade in spices and other precious goods. Goa was the largest and most enduring colony in Asia, remaining under Portuguese control until 1961. In Africa, the Portuguese colonised areas that are now Mozambique and Angola. There they exploited slave plantations and other natural resources. In South America, Brazil was the most important colony of the Portuguese empire. The Portuguese began colonising Brazil in the early 16th century and it remained a Portuguese colony until its independence in 1822. During this period, the Portuguese exploited Brazil's rich natural resources, including precious woods, gold, diamonds and sugar cane.
 
The Portuguese Empire had colonies in Africa that included Angola, Mozambique, Guinea-Bissau (then known as Portuguese Guinea), Cape Verde, Sao Tome and Principe and parts of what is now Namibia. Angola and Mozambique were the Portuguese Empire's most important colonies in Africa. The Portuguese began exploring and colonising these regions in the 15th century. They established trading posts along the coast and eventually took control of vast territories inland, where they exploited natural resources and set up plantations using slave labour. Guinea-Bissau, Cape Verde and Sao Tome and Principe were smaller but important colonies for the Portuguese. They used them mainly as ports of call for their ships en route to other colonies in Africa, Asia and South America. Portugal's colonial rule over these territories lasted until the middle of the 20th century. National liberation movements led to wars of independence in these countries, which became independent in the 1970s.
 
=== The Italian Empire ===
Italy was one of the last European powers to take part in the partitioning of Africa. Its colonial empire was relatively small compared with those of Britain and France, but it did include significant territories.
 
Eritrea and Italian Somalia (also known as Italian Somaliland) were Italian colonies on the east coast of Africa. Eritrea was the first colony to be acquired by Italy in 1890, while Somalia became a colony in 1908. These territories provided Italy with a strategic presence along the important trade route of the Suez Canal, as well as access to agricultural and mineral resources. Eritrea and Somalia provided Italy with a strategic position to control important trade routes along the Red Sea and the Indian Ocean. These colonies were also important for agriculture and the extraction of raw materials, which played an essential role in supplying the Italian economy. In Eritrea, the Italians built a network of railways and roads, as well as modern cities such as Asmara, which today is renowned for its Art Deco architecture. They also developed coffee and cotton plantations, exploiting the labour of the local population. In Somalia, the Italians also established agricultural plantations, mainly to produce bananas for export to Italy. The Italians also introduced new farming techniques and crops such as maize and citrus fruit.
 
Libya, on the other hand, was obtained as a result of the Italo-Turkish war of 1911-1912, during which Italy dislodged the Ottoman Empire from this territory. Libya was colonised as part of an effort to establish a "new Rome" in North Africa. Italy conquered Libya as part of the Italo-Turkish War, dislodging the Ottoman Empire from the territory. However, Italian control of Libya was far from peaceful. It was marked by intense local resistance, particularly during the Libyan War (1911-1932), which is often regarded as one of the longest and most costly colonial conflicts of the 20th century. Omar Mukhtar, a Libyan resistance leader, led a guerrilla campaign against the Italians. He succeeded in mobilising the tribes of the Cyrenaica region against the Italian occupation. Mukhtar was a skilled military strategist and managed to conduct effective guerrilla operations against the Italians for almost two decades. However, the Italians' military superiority, combined with their desire to crush the resistance at all costs, eventually led to Mukhtar's capture and execution in 1931. Libyan resistance continued for some time after his death, but the Italian occupation of Libya lasted until the Second World War, when Allied forces succeeded in expelling Italian and German forces from Libya. The Italian occupation had a profound impact on Libya, particularly in terms of its demography, economy and infrastructure. Italy encouraged the migration of Italian citizens to Libya, which changed the demographic composition of some parts of the country. The Italians also built roads, schools and other infrastructure, but they exploited Libya's resources for their own benefit.
 
These colonies remained under Italian control until the Second World War, when Allied forces dislodged the Italians from these territories. After the war, these territories became independent: Eritrea was initially annexed by Ethiopia before gaining independence in 1993, Somalia became independent in 1960, and Libya in 1951.
 
=== Russia ===
Russia's territorial expansion has been marked by a series of conquests and annexations of territories throughout its history. This expansion was often carried out by military means, and involved the integration of many different peoples and cultures into the Russian Empire. During the 19th century, Russia expanded eastwards into Asia and southwards into the Caucasus and Central Asia. This involved the conquest of vast territories, populated by many different ethnic groups. The consequences of this expansion are still visible today, particularly in the tensions that exist between the Russians and certain minority groups, such as the Chechens. Chechnya, located in the North Caucasus region, became part of the Russian Empire in 1859. However, relations between the Chechens and the Russian government have always been strained. The Chechens, with their distinct history, culture and religion, have often resisted Russian rule, and there have been several attempts at secession over the years.
 
In 1867, Russia sold Alaska to the United States for $7.2 million, a deal known as the 'Alaska Purchase'. At the time, some Russians criticised the sale, believing that Russia was abandoning a potentially valuable territory. However, Alaska was at the time a remote and difficult territory for Russia to administer. From the American point of view, the purchase of Alaska proved extremely beneficial in the long term. Alaska is rich in natural resources, including oil, natural gas, gold and fish. The discovery of gold in the territory at the end of the 19th century triggered a gold rush, and in the 20th century Alaska became a major source of oil for the United States. So although the Alaska Purchase was initially derided as "Seward's folly" (named after the US Secretary of State William H. Seward who orchestrated the deal), it is now generally regarded as an excellent deal for the US.
 
=== Japan ===
Both Japan and the United States established colonial empires from the nineteenth century onwards, although their colonial approach and ideology differed from those of European empires. Japan, having modernised and industrialised following the Meiji era, began looking for territories to colonise at the end of the nineteenth century. Taiwan and Korea became Japanese colonies in 1895 and 1910 respectively. Japan's colonial expansion continued in the 1930s and 1940s, with the invasion of Manchuria, China and various territories in the South Pacific. The United States, meanwhile, began acquiring colonies following the Spanish-American War of 1898. It gained control of Puerto Rico, Guam and the Philippines as a result of this war, and also annexed Hawaii in 1898. The United States also exercised control over other territories, such as Samoa and the Virgin Islands. However, the American ideology of "manifest destiny" and democratic traditions often created a tension between colonial objectives and national ideals.
 
The Meiji era in Japan, which began in 1868 and ended in 1912, was a period of rapid and radical modernisation. The Meiji government sought to establish Japan as a modern industrialised nation capable of competing with the Western powers. These modernisation efforts included massive political reform, the adoption of Western industrial technologies, the establishment of a Westernised education system, and the development of a modern army and navy. One of the main motivations behind these reforms was Japan's desire to avoid the fate of many other Asian countries that had been colonised or dominated by Western powers. Japan saw what was happening to countries like China and India and decided to adopt a policy of assimilation and adaptation of key aspects of Western culture, technology and organisation, rather than resistance. This enabled Japan not only to avoid colonisation, but also to become a colonial power itself. In 1895, Japan won the first Sino-Japanese war, which marked the beginning of Japanese imperialism in Asia. As a result, Japan acquired Taiwan and the Pescadores Islands. Later, in 1910, Japan annexed Korea, making it a colony. During the first half of the 20th century, Japan continued to expand its empire, occupying part of China (Manchuria) and many territories in the Pacific during the Second World War.
 
Japan began its imperialist policy with the annexation of the island of Taiwan in 1895 following victory in the Sino-Japanese War. Japan then acquired new colonies in Asia, notably Korea in 1910, as well as territories in the Pacific and China during the Second World War. In 1895, following the First Sino-Japanese War, Japan acquired Taiwan and the Pescadores Islands of China, marking the beginning of its imperial expansion. In 1905, following the Russo-Japanese War, Japan gained further territory, including China's Liaodong Peninsula (which includes Port Arthur, a major naval base) and Sakhalin Island to the north. It was the first time an Asian nation had won a major victory over a European power, and it radically changed the balance of power in the region. In 1910, Japan officially annexed Korea, ending the Joseon dynasty and establishing colonial rule. Japanese control of Korea was particularly brutal, with many cases of forced labour, cultural repression and other human rights abuses. In the 1930s and 1940s, Japan continued its expansion into China, including the invasion of Manchuria in 1931 and the establishment of a puppet state called "Manchukuo". This led to wider conflicts with China and eventually to Japan's entry into the Second World War. During the Second World War, Japan conquered large areas of the Pacific and South East Asia, including the Philippines, Indonesia, Malaysia, Singapore and much of Burma. However, these territorial gains were lost when Japan surrendered to the Allies in 1945.
 
Japan's colonial empire was dismantled at the end of the Second World War, and the country was forced to relinquish all its overseas territories under the Treaty of San Francisco in 1951.
 
=== The United States ===
After independence, the United States pursued a policy of territorial expansion on its own continent, known as "Manifest Destiny". This policy held that the United States was destined to expand from coast to coast across the North American continent. This led to the annexation of vast tracts of land, including the Louisiana Territory in 1803, Florida in 1819, Texas in 1845 and the south-western territories following the Mexican-American War of 1846-1848. However, it was towards the end of the 19th century that the United States began to establish colonies outside its continent, adopting a form of imperialist policy. This was fuelled by various factors, including the desire for new economic opportunities, the need to establish military bases abroad in support of the Monroe Doctrine (which aimed to prevent interference by European powers in the affairs of the Americas) and the influence of certain ideologies, such as Social Darwinism.
 
The Spanish-American War of 1898 led the United States to acquire several Spanish territories, including the Philippines, Puerto Rico, Guam and Cuba. These acquisitions marked a break with past US policy, which had focused primarily on expansion in North America. The annexation of these territories provoked heated debate in the United States. Some Americans, including many members of the Anti-Imperialist Party, condemned these actions as contrary to the democratic and anti-colonial principles on which the nation had been founded. However, others, such as President Theodore Roosevelt, supported expansion as a demonstration of national greatness and a means of competing with European empires on the world stage. The US also annexed Alaska (bought from Russia in 1867) and Hawaii (which became a US territory in 1898 after the Hawaiian monarchy was overthrown by American settlers in 1893).
 
After the Second World War, the United States began to distance itself from traditional colonialism and chose to promote its influence through economic and political means rather than through the direct occupation of foreign territories. This was done in the context of decolonisation, as many former colonies gained their independence. That said, the US continued to maintain certain territorial possessions, such as Puerto Rico, Guam, the Northern Mariana Islands, the US Virgin Islands, and the remote minor island in the Pacific Ocean. Although these territories are not colonies in the traditional sense of the term, they remain under US sovereignty and their inhabitants are US citizens. However, they do not enjoy all the same rights as citizens residing in the 50 States - for example, they cannot vote in presidential elections unless they reside in one of the States. Furthermore, American strategy in the twentieth century evolved to become more economic and diplomatic, with a strong emphasis on trade agreements, financial aid, political and military alliances, and the promotion of democracy and human rights. These strategies helped establish the United States as a global superpower, despite the decline of its colonial empire.


== Rivalry and competition: the Race for Colonies ==
== Rivalry and competition: the Race for Colonies ==


The conquest of new lands created a rivalry between the different colonial powers, which sought to extend their influence and domination over the richest and most strategic territories. This rivalry led to a veritable "race for the colonies" in the second half of the 19th and early 20th centuries. The great European powers, such as France, the United Kingdom, Germany, Italy and Portugal, but also Japan and the United States, engaged in this race for colonies, often to the detriment of the indigenous peoples who inhabited these territories. This competition was particularly intense in Africa, where the colonial powers sought to control natural wealth, especially raw materials such as rubber, diamonds, gold and oil. This rivalry between colonial powers also fuelled tensions and conflicts, such as the Boer War in South Africa (1899-1902), the Italian-Ethiopian War (1935-1936) and the Franco-Tunisian War (1881). Rivalry between the great powers was also one of the causes of the First World War, where colonial issues were one of the factors of tension between European nations.  
The aspiration to conquer new territories gave rise to intense rivalry between different colonial powers. In their quest to extend their sphere of influence and domination, the colonial powers targeted the most strategic and richest territories. This gave rise to a veritable "race for colonies" from the second half of the nineteenth century to the beginning of the twentieth, involving major European powers such as France, the United Kingdom, Germany, Italy and Portugal, as well as Japan and the United States. Their expansion was often at the expense of the indigenous populations of these territories.  
 
Africa became a particularly hotbed of this competition, as the colonial powers sought to appropriate the continent's abundant natural wealth, including raw materials such as rubber, diamonds, gold and oil. Colonial rivalry helped inflame tensions and provoke major conflicts, such as the Boer War in South Africa (1899-1902), triggered by the dispute between the United Kingdom and Boer settlers over control of gold and diamond mines; or the Italo-Ethiopian War (1935-1936), when Mussolini's fascist Italy invaded Ethiopia, one of the few African countries to have resisted European colonisation, in a bid for national prestige and a desire to control Ethiopia's resources; and the Franco-Tunisian War (1881), which led to the establishment of a French protectorate over Tunisia, motivated by security concerns and economic interests in Tunisia, such as olive oil, wheat and mining.
 
In addition, competition between these great powers was a contributing factor to the outbreak of the First World War, with colonial issues exacerbating tensions between European nations.


== The Berlin Conference: Sharing Africa ==
== The Berlin Conference: Partition of Africa ==


[[File:Kongokonferenz.jpg|thumb|right|300px|Representation of the Berlin Conference (in 1884) where representatives of the European powers met.]]
[[File:Kongokonferenz.jpg|thumb|right|300px|Representation of the Berlin Conference (1884), attended by representatives of the European powers.]]


The Berlin Conference was held from 15 November 1884 to 26 February 1885 in Berlin, Germany. Its aim was to settle the problems of colonial rivalries between the various European powers by sharing the areas of influence and the territories to be colonised in Africa. The German Chancellor Otto von Bismarck organised the conference and brought together 14 European countries and the United States. The decisions taken at this conference led to the almost total colonisation of Africa by the European powers.  
The Berlin Conference, also known as the West Africa Conference, was held from November 1884 to February 1885 in Berlin, Germany. The meeting was intended to ease tensions and resolve problems arising from colonial rivalries among the various European powers. The main objective was to divide Africa into zones of influence and territories to be colonised, thus defining the rules of the game for the Race to Africa.  


Bismarck's main objective was to maintain peace in Europe, avoiding any confrontation with France, which had lost Alsace-Lorraine in the Franco-Prussian War of 1870-1871. By promoting French colonisation in North Africa, he hoped to ease tensions with France and avoid a war. However, Bismarck also sought to strengthen Germany's position in the race for colonies in Africa. Therefore, at the Berlin Conference, Germany obtained several territories in West Africa, including Togo and Cameroon.  
The conference, initiated by German Chancellor Otto von Bismarck, brought together 14 nations, including all the major European powers of the time, as well as the United States. During the conference, the participants drew up regulations concerning the annexation of African territories, stipulating that any territorial claim had to be notified to the other powers and that the claiming power had to occupy the territory concerned. This conference had a major impact on the history of Africa, leading to the arbitrary drawing of borders and the division of the continent between the European powers. This partition, which largely ignored existing ethnic and cultural realities in Africa, had long-term consequences for the continent's political, social and economic development.


The Berlin Conference made it possible to organise the colonisation of Africa and to delimit the areas of influence of the European colonial powers on the continent. Still, it also exacerbated rivalries between the latter. Indeed, the race for colonies generated conflicts and tensions between the different powers, which clashed over the colonised territories. Thus, the rivalry between Great Britain and France crystallised in North Africa, where the two countries fought over the control of Egypt and Sudan. Similarly, the rivalry between Great Britain and Russia led to clashes in Central Asia, particularly over Afghanistan. Finally, the rivalry between Germany and France manifested itself in West Africa, where the two countries fought for control of Togo and Cameroon. These colonial rivalries contributed to an atmosphere of tension in Europe, which eventually led to the First World War. Indeed, colonial rivalries fuelled tensions between European powers, which fought an all-out war for control of colonial territories.
The decisions taken at the Berlin Conference catalysed the colonisation of Africa by the European powers. By establishing rules for the division of Africa, the conference paved the way for the accelerated occupation and annexation of the continent. After the conference, the map of Africa began to resemble a patchwork of colonies controlled by different European powers. For example, France took control of large areas of West and Central Africa, the United Kingdom extended its hold over East and Southern Africa, while other countries such as Germany, Portugal, Italy and Belgium also acquired important territories.
 
Otto von Bismarck, as German Chancellor, had a dual objective at the Berlin Conference. On the one hand, he sought to ease tensions with France, which was still unhappy about the loss of Alsace-Lorraine as a result of the Franco-Prussian War. Bismarck hoped that supporting French colonial expansion in North Africa would distract France from its desire to retake Alsace-Lorraine. On the other hand, Bismarck's ambition was to strengthen the international status of the newly unified Germany. He wanted Germany to be recognised as a legitimate colonial power by the other European nations. So, at the Berlin Conference, Germany laid claim to several territories in Africa, including Togo and Cameroon in West Africa, as well as German South-West Africa (present-day Namibia) and German East Africa (comprising parts of present-day Burundi, Rwanda and Tanzania). Bismarck had some success in achieving these goals.
 
The Berlin Conference established a framework for the organisation of the colonisation of Africa, delimiting the zones of influence of the various European colonial powers on the African continent. However, this major historical event also amplified the rivalries between these same powers. Colonial greed led to tensions and conflicts between the various nations, particularly as they expanded into newly acquired territories. For example, intense competition crystallised between Great Britain and France in North Africa, with Egypt and Sudan the main stakes. Similarly, antagonism between Great Britain and Russia manifested itself in clashes in Central Asia, particularly around Afghanistan. Germany and France also expressed their colonial rivalry in West Africa, where they battled for control of Togo and Cameroon. These colonial rivalries created a climate of uncertainty and tension in Europe, a precarious atmosphere that eventually led to the outbreak of the First World War. Colonial conflicts soured relations between the European powers, dragging them into an all-out war for control of colonial territories. This historical context shows the extent to which colonial issues were a determining factor in the international tensions that led to the outbreak of the Great War.


== The Impact of the Colonisation of Africa ==
== The Impact of the Colonisation of Africa ==


[[File:Egypt sudan under british control.jpg|thumb|British Egypt and Sudan. On this 1912 map, the site of Fachoda (''Kodok'') can be seen to the south on the Nile.]]
[[Fichier:Egypt sudan under british control.jpg|thumb|British Egypt and Sudan. This 1912 map shows the site of Fachoda (Kodok) to the south, on the Nile.]]


In the early 18th century, most parts of Africa were independent political entities with their own cultures, languages and political systems. Europeans had established trading posts and coastal settlements, but most of the interior of the continent remained beyond their reach. However, over time, European powers increased their presence in Africa, using military, political and economic means to expand their influence on the continent.
At the dawn of the 18th century, the vast majority of African regions were governed by autonomous political entities, each with its own distinct cultures, languages and political systems. While Europeans had succeeded in establishing trading posts and coastal colonies, most of the interior of the continent remained largely inaccessible to their influence. Over the years, however, the European powers gradually increased their presence in Africa. Their means of asserting their influence on the continent were varied, ranging from military force to the imposition of political and economic controls. This gradually transformed the political map of Africa as the European powers expanded their colonial empires.


Rivalries between the colonial powers also took place in Africa. The Berlin Conference of 1884-1885 was the starting point for the colonisation of Africa by the European powers. The European countries divided the African continent among themselves, without taking into account the traditional borders between the different African ethnic groups and cultures. Rivalries between the colonial powers led to armed conflicts between them for the possession of certain regions in Africa, such as the Boer War in South Africa between the British and the Afrikaners, or the Italian-Ethiopian War of 1895-1896.
In Africa, the colonial powers also found themselves competing to extend their territories. The official start of the colonisation of Africa by these European powers was recorded at the Berlin Conference of 1884-1885. This meeting led to an arbitrary division of the African continent between European nations, with no regard for the traditional borders or distinct cultures of the various African ethnic groups. The rivalries that resulted from this partition led to several armed conflicts for control of specific regions of Africa. For example, the Boer War in South Africa pitted the British against the Afrikaners, descendants of Dutch settlers, for control of the gold and diamond mines. Similarly, the Italian-Ethiopian War of 1895-1896 was sparked by Italy's colonial ambitions in Ethiopia, one of the few African nations that had resisted European colonisation. These conflicts illustrated the brutality of colonial competition, with lasting repercussions on African societies.


Europeans also sought to extend their influence in Africa by indirect means, such as signing treaties with local chiefs, creating protectorates or zones of influence. The colonisation of Africa had dramatic consequences for the African people, including the loss of their sovereignty, the dispossession of their land and natural resources, the exploitation of African labour, and the suppression of their cultures and traditions.
As well as using military force, the European powers also employed indirect methods to increase their hold on Africa. For example, they signed treaties with local rulers, established protectorates and created zones of influence. Although these methods may have seemed more subtle, they still resulted in a loss of sovereignty for the people of Africa. The impact of colonisation on these populations was devastating. Africans were dispossessed of their land and natural resources. In addition, European settlers often exploited the African workforce, forcing them to work in difficult conditions and for derisory pay. In addition, colonisation often led to the suppression of local cultures and traditions. Europeans sought to impose their own culture, language and religious beliefs, thus contributing to the erosion of African cultural identities.


At the beginning of the 20th century, the European powers divided Africa into zones of influence, but this did not prevent rivalries and conflicts between them for the domination of certain regions.
At the beginning of the twentieth century, Africa had been divided up between the European powers, defining specific zones of influence for each of them. However, this division did not put an end to rivalries and tensions, and conflicts continued to erupt over control of certain regions. These ongoing power struggles reflect the intensity of colonial ambition at the time, as each nation sought to maximise its control and influence over the African continent.


Britain and France were two major colonial powers that sought to extend their influence in Africa in the 19th century. Britain gradually established its hold on Egypt, Sudan, South Africa, Southern Rhodesia (now Zimbabwe) and East Africa. France, on the other hand, expanded its empire in West Africa (Senegal, Mali, Ivory Coast, Niger, Burkina Faso, Guinea), Central Africa (Chad, Congo-Brazzaville) and East Africa (Djibouti, French Somalia). The rivalry between these two colonial powers was exemplified by the Fachoda crisis of 1898, which pitted France and Britain against each other over the Upper Nile region, but was eventually resolved peacefully through diplomatic compromise.
Britain and France, as the dominant colonial powers, sought to expand their sphere of influence in Africa during the nineteenth century. Over time, the British Empire consolidated its hold on territories such as Egypt, Sudan, South Africa, Southern Rhodesia (now Zimbabwe) and various parts of East Africa. For its part, France extended its hold in West Africa, encompassing Senegal, Mali, Côte d'Ivoire, Niger, Burkina Faso and Guinea, as well as in Central Africa with Chad and Congo-Brazzaville, not forgetting East Africa with Djibouti and French Somalia.


France, which had succeeded in colonising Tunisia in 1881, came into conflict with Italy, which also had hopes of colonising the territory. This created a rivalry between France and Italy in North Africa. Indeed, Italy saw France's colonisation of Tunisia as a missed opportunity to expand in the region.
One of the most notable illustrations of the rivalry between these two great colonial powers was the Fachoda crisis in 1898. This episode saw France and Great Britain squabbling over control of the Upper Nile region, an area of major strategic importance. Despite the risk of escalating into armed conflict, the situation was eventually resolved peacefully through diplomatic compromise, underlining the importance of negotiations in settling colonial disputes.


After the 1890s, Germany began to turn to a global expansion policy, opposing Britain and France's colonial ambitions in Africa. This policy culminated in the Moroccan crisis of 1905-1906, when Germany opposed the French protectorate over Morocco. This crisis highlighted the rivalries between the European powers for control of colonies and areas of influence, and led to diplomatic negotiations to resolve the conflict.
France's colonisation of Tunisia in 1881 raised tensions with Italy, which also had colonial ambitions for the territory. Italy, with a large community of Italians living in Tunisia at the time and significant commercial interests, hoped to use Tunisia as an extension of its sphere of influence in North Africa. France's success was therefore perceived by Italy as a missed opportunity, fuelling a rivalry between the two nations. This tension was a contributing factor in Italy's subsequent quest for colonial expansion in Africa, notably with the conquest of Libya in 1911 and Ethiopia in the 1930s under Mussolini.
 
Under Kaiser Wilhelm II, Germany adopted a policy of colonial expansion and rivalry with the other European powers, particularly Britain and France. This policy, known as Weltpolitik, aimed to make Germany a world power on a par with its competitors. The Moroccan crisis of 1905-1906, also known as the First Moroccan Crisis, is a clear example of these colonial tensions. Germany opposed French control over Morocco, putting forward the principle of free trade and challenging France's dominance over the territory. However, at the Algeciras conference in 1906, which aimed to resolve the crisis, the majority of the participating countries supported France's position, thus isolating Germany. This conflict not only exacerbated tensions between Germany and France, but also highlighted the rivalries between the European powers for control of colonial territories. It also led to a strengthening of the Entente Cordiale between France and Great Britain, as they sought to thwart Germany's colonial ambitions.


== The dismantling of the Ottoman Empire ==
== The dismantling of the Ottoman Empire ==
The Ottoman Empire experienced a gradual economic, political and military decline throughout the 19th century. European powers, notably Britain, France and Russia, became increasingly interested in the lands and resources of the Ottoman Empire. This rivalry between the European powers was particularly evident in the Crimean War (1853-1856), which pitted Russia against the British, French and Ottoman empires. The question of the Ottoman Empire also became a major issue in the relations between Great Britain and Russia in Central Asia. Both powers sought to extend their influence in the region and to control the strategic trade routes that crossed it, notably the Silk Road. This rivalry led to the Anglo-Afghan War of 1878-1880 and the Russo-Turkish War of 1877-1878.
During the 19th century, the Ottoman Empire, nicknamed "the sick man of Europe", was in constant decline, weakened by a series of internal problems such as economic difficulties, ethnic tensions and religious conflicts. As a result, European powers, including Britain, France and Russia, sought to take advantage of this weakness to increase their influence in the territories of the Empire.


From the second half of the 19th century onwards, the Ottoman Empire lost its influence and became increasingly dependent on the great European powers. Several factors contributed to this situation, including the rise of Europe and the Industrial Revolution, which gave European countries an economic and military advantage over the Ottoman Empire. In addition, internal conflicts, wars and revolts weakened the central power of the Ottoman Empire, thus weakening its position on the international scene. The great European powers then sought to take advantage of this situation by extending their influence over the territories of the Ottoman Empire. As a result, the Ottoman Empire became increasingly subject to the interests and decisions of the European Great Powers.
The Crimean War (1853-1856) is a clear example. This conflict pitted Russia against a coalition comprising the Ottoman Empire, the United Kingdom, France and the Kingdom of Sardinia. One of the underlying reasons for the conflict was the struggle for control of the Holy Places of Christianity in the Holy Land, then under Ottoman control. The conflict revealed the military weakness of the Ottoman Empire and the interest of the major European powers in dismantling it. In Central Asia, the rivalry between Russia and the United Kingdom, known as the "Great Game", centred on control of Afghanistan and the surrounding regions. Both powers feared that an advance by the other would offer a strategic advantage in the region. Tensions came to a head during the Second Anglo-Afghan War (1878-1880), when the UK sought to counter Russian influence by establishing a favourable regime in Kabul. At the same time, the Russo-Turkish War of 1877-1878 demonstrated the Ottoman Empire's inability to resist a Russian invasion. The Treaty of San Stefano that ended the war was largely in Russia's favour, which alarmed the other major powers and led to a revision of the treaty at the Congress of Berlin in 1878. These geopolitical rivalries not only exacerbated tensions between the great European powers, but also triggered a series of wars and conflicts in the territories of the Ottoman Empire, the consequences of which helped to shape the Middle East and the Balkans as we know them today.


The Balkan Wars of 1912-1913 were marked by conflicts between the European powers over the extension of their influence in the Balkans. The Balkans was a strategic region for the Great Powers because of its geographical position and economic importance. The Balkan Wars saw the Ottoman Empire lose almost all its territories in Europe, leaving only Constantinople and part of Thrace. The fall of the Ottoman Empire in Europe reinforced the rivalry between the major European powers for the sharing of areas of influence in the Middle East. The European powers, especially Britain and France, began to compete for control of the Ottoman Empire's territories, especially in Syria, Palestine and Mesopotamia. This rivalry was an important factor in the outbreak of the First World War in 1914.
Several factors contributed to this situation, including the rise of European power, the Industrial Revolution, internal conflicts, wars and revolts. The Industrial Revolution, which began in the 18th century in Britain before spreading to Europe and beyond, created a great disparity in economic and military power. European countries were able to use their industrial advantage to build powerful armies and fleets, and were able to establish colonial empires across the world. Meanwhile, the Ottoman Empire remained largely agrarian and feudal, with no significant industrial capacity. Internally, the Ottoman Empire was also plagued by problems. Uprisings broke out across the empire, such as the Serbian uprising of 1804-1815, the Greek War of Independence of 1821-1830, and the Bulgarian, Armenian and Arab revolts later in the 19th century. These uprisings not only drained the empire's resources, but also exposed its weakness to the outside world. Moreover, military defeats, such as in the Russo-Turkish War of 1877-1878, weakened the Ottoman Empire's international position. As a result, the great European powers, such as Great Britain, France, Russia, and later Germany and Italy, began to compete for influence over the Ottoman Empire. This led to what is often referred to as the "Eastern Question" - a diplomatic debate about how the European powers should deal with the decline of the Ottoman Empire. This created a complex web of alliances and rivalries between the European powers, contributing to the international tension that eventually led to the First World War. The Ottoman Empire subsequently collapsed after its defeat in the First World War, and the modern Republic of Turkey was founded in 1923.


The Italian conquest of Libya in 1911 is an example of the disintegration of the Ottoman Empire. This conquest was facilitated by the weakness of the Ottoman Empire and the rivalries between the major European powers, all of whom sought to take advantage of the situation. The subsequent Italo-Turkish War resulted in the defeat of the Ottoman Empire and the loss of Libya and several other territories. This defeat contributed to the weakening of the Ottoman Empire and its isolation on the international scene.
The Balkan Wars were an intense conflict that led to a major redistribution of power in the Balkan region.


The discovery of oil at the beginning of the 20th century was a major issue for the European powers and contributed to their interest in oil-producing regions. European oil companies established themselves in the countries of the Middle East and North Africa, and the major powers sought to secure their oil supplies by securing control of these regions. This race for oil was also a factor in tensions and rivalries between the European powers and contributed to the rise in international tensions that led to the First World War. The decline of the Ottoman Empire was partly due to its inability to modernise its economy and adapt to the technological changes of the time, including the use of oil as an energy source. The great European powers, on the other hand, quickly realised the importance of oil and sought to control access to it to ensure their economic and political dominance. The discovery of oil deposits in the Black Sea region and the Middle East thus exacerbated the rivalries between the European powers and accentuated the decline of the Ottoman Empire, which was struggling to exploit its own oil resources. European and American oil companies quickly gained a foothold in the region, taking advantage of the political instability and weakness of the Ottoman Empire to impose their economic interests.
The Ottoman Empire lost much of its territory in the Balkans to the Balkan states of Bulgaria, Serbia, Montenegro and Greece, which had allied themselves in the First Balkan War (1912-1913) against the Ottoman Empire. However, these allies soon quarrelled over the division of the conquered territories, triggering the Second Balkan War (1913) in which Bulgaria fought its former allies and eventually lost part of the territory it had won in the first war. The Balkan Wars exposed the Ottoman Empire's military weaknesses and showed that the Ottoman Empire was in rapid decline. They also created instability and tension in the Balkan region, which eventually escalated into the First World War. After the First World War, the Ottoman Empire was completely dismantled, and its remaining territories were divided between the victorious Allied Powers, mainly Great Britain and France, under the terms of the 1920 Treaty of Sèvres. These powers created mandates to administer the territories, creating Syria and Lebanon under the French mandate, and Iraq and Palestine under the British mandate. This division of the Middle East had lasting consequences for the region, some of which are still felt today.
 
The Italo-Turkish War of 1911-1912, also known as the Tripolitan War, marked an important stage in the disintegration of the Ottoman Empire. Italy was seeking to assert itself as a colonial power and saw Ottoman Libya (then known as Tripolitania and Cyrenaica) as an opportunity to do so. The Ottoman Empire, already weakened and having problems controlling its vast territories, was unable to effectively resist the Italian invasion. The war was finally resolved by the Treaty of Lausanne (1912), which confirmed Italy's annexation of Libya. Italy also took control of the Dodecanese islands in the Aegean Sea. This was a major defeat for the Ottoman Empire and a further sign of its decline. The loss of Libya not only weakened the Ottoman Empire, but also shifted the balance of power in the Mediterranean in Italy's favour. It would be one of many territorial losses for the Ottoman Empire over the next two decades.
 
The discovery of vast oil reserves in the Middle East played a significant role in the international politics of the early twentieth century. Oil was identified as a strategically vital resource for the economy and security of industrialised nations, and obtaining and controlling its supply became a major foreign policy objective for many powers. The major European powers, particularly Britain and France, sought to establish control and influence over oil-producing regions such as Persia (modern Iran) and Iraq. Control of these regions was essential to fuel their economies and naval fleets. This led to new rivalries and tensions as nations fought over control of oil-rich areas. For example, the Sykes-Picot Agreement of 1916, which divided the Middle East between France and Britain, was largely motivated by the desire to control access to oil resources.
 
Despite its natural resources, including oil, the Ottoman Empire failed to modernise sufficiently to compete with the great European powers in the late 19th and early 20th centuries. Its inability to implement effective reforms, corruption, mismanagement and political instability contributed to its economic and military decline. The discovery of oil transformed the geopolitics of the region. The great powers, in particular Great Britain and France, realised very early on the strategic importance of oil for warfare and industrialisation. They therefore sought to secure access to these resources, either through direct colonisation or through protectorates and agreements with local leaders. For example, the British Anglo-Persian Oil Company (which later became BP) obtained a concession to explore for oil in Persia (modern-day Iran) in 1901. Later, the French company Compagnie française des pétroles (now Total) obtained exploration rights in the Middle East following the Sykes-Picot Agreement in 1916. These developments not only exacerbated rivalries between the great European powers, they also accelerated the decline of the Ottoman Empire and contributed to the rising tensions that led to the First World War. It also had a lasting impact on the region, which remained at the centre of international conflicts over the control of oil throughout the twentieth century.


== The Stakes of the Far East ==
== The Stakes of the Far East ==
The Far East was also an area of rivalry between the colonial powers, notably Britain, Russia and Japan. Britain was particularly concerned about Russia's rise in Central Asia and its presence in Manchuria, which threatened its interests in India. The British also had important economic interests in China, which was then a lucrative market for British exports.
The Far East was an area of major imperial rivalry, particularly at the turn of the 20th century. Russia's growing influence in the region, particularly in Manchuria and Korea, was of concern to Britain and Japan. Russia sought to secure access to the Pacific Ocean, which would give it an independent eastern route out of the often frozen Arctic route. Britain, for its part, saw Russian expansionism in Central Asia as a threat to its own interests in India, the "jewel in the crown" of the British Empire. As for China, it had been the object of the appetite of the colonial powers since the mid-nineteenth century. Great Britain had imposed unequal treaties on China following the Opium Wars, giving it access to the Chinese market. France, Germany, Russia and Japan subsequently obtained similar concessions. Japan, for its part, was seeking to become an imperialist power in its own right. Its victory over Russia in the Russo-Japanese War of 1904-1905 was a key moment, enabling it to establish its dominance in Korea and strengthen its presence in Manchuria. These rivalries in the Far East contributed to the rise in international tensions at the beginning of the 20th century. They also had a lasting impact on the region, contributing to the emergence of conflicts such as the Russo-Japanese War, the First and Second World Wars, and the subsequent conflicts in Korea and Vietnam.


Colonial rivalries in the Far East led to several conflicts, including the Russo-Japanese War of 1904-5, which saw Russia defeated by Japan, an emerging regional power. This conflict demonstrated the vulnerability of colonial powers to determined adversaries and had an impact on international relations in the region and beyond.
The Russo-Japanese War of 1904-1905 had major international implications. One of the most significant consequences was the reorganisation of the balance of power in the Far East. Until then, Russia had been perceived as a major force in the region. Its defeat at the hands of Japan, a non-Western country that had modernised with impressive speed since the Meiji Restoration in 1868, took the world by surprise. It showed for the first time that a non-European power could defeat a major European power in a major military conflict. Japan emerged from the war with an enhanced status, being recognised as a major world power. It gained control of Korea (which it officially annexed in 1910) and the Russian territory of Port Arthur in Manchuria. In addition, Japan's victory had an impact on non-Western colonies and countries around the world. It stimulated nationalist movements in several Asian countries, notably India and China, which saw Japan's victory as proof that resistance against Western imperialism was possible. However, the Russo-Japanese war also led to an escalation of tensions in the Far East. Japan's rise to power created anxiety among the other colonial powers, notably the United States, and laid the foundations for other conflicts in the region, including the Second World War in the Asia-Pacific.


Afghanistan was a strategic country for the Russian and British empires because of its geographical position between the two powers. In 1878-79, Britain fought the Second Anglo-Afghan War, which resulted in the creation of an independent buffer state between the Russian Empire and British India. Russia had attempted to extend its influence over Afghanistan, which led Britain to intervene to protect its interests in the region. This rivalry between the two European powers had dramatic consequences for Afghanistan, which faced numerous conflicts and political instabilities throughout the 20th century.
The geopolitical situation in Afghanistan was marked by the "Great Game", an intense strategic and political rivalry between the British Empire and the Russian Empire for control of Central Asia in the 19th century. Afghanistan, with its strategic geographical position, was seen by the British as an essential bulwark for the protection of their colonial jewel, India. The Russians, for their part, saw Afghanistan as a potential stage in their expansion to the south and east. The Second Anglo-Afghan War (1878-1880) was a direct consequence of these rivalries. The British, fearing growing Russian influence on the Afghan regime, invaded Afghanistan in 1878. After a series of battles, the Treaty of Gandamak was signed in 1879, guaranteeing Afghanistan a degree of autonomy while bringing its foreign policy under British control. These events had a lasting impact on Afghanistan and the surrounding region. They contributed to a long period of instability and conflict in the country, and defined Afghanistan's role as a contested zone of influence within the wider framework of international rivalries. Subsequently, the involvement of the great powers in the region persisted throughout the twentieth century and into the twenty-first, with significant consequences for the history of Afghanistan.


The forced opening up of China by foreign powers from 1840-1850, known as the 'unequal treaty', led to significant tensions in China. Western powers, led by Britain, sought to establish concessions in Chinese ports to facilitate trade, but also to extend their influence over the whole country. Conflicts resulting from these imperialist ambitions led to several wars, including the Opium War (1839-1842), the Sino-Japanese War (1894-1895) and the Boxer Rebellion (1899-1901). These events weakened the Qing Dynasty and led to the creation of foreign zones of influence in China.
In the 19th century, the Western powers used their military superiority to force China to open up to their commercial activities. The unequal treaties, which were highly disadvantageous to China, granted the foreign powers numerous rights, including the establishment of concessions where they exercised extraterritorial jurisdiction, the opening up of numerous ports to international trade, and costly war indemnities. The Opium War, triggered by China's refusal to allow the opium trade, led to the first series of unequal treaties, most notably the Treaty of Nanking in 1842, which not only forced China to legalise the opium trade, but also ceded Hong Kong to the British and opened several ports to foreign trade. The Sino-Japanese War of 1894-1895 marked the rise of Japan as a colonial power. China was forced to recognise the independence of Korea, previously a Chinese tributary, and to cede Taiwan and the Pescadores Islands to Japan. The Boxer Rebellion, an anti-Western rebellion, was crushed by an alliance of eight foreign nations, further strengthening their influence and control over China. These events not only weakened the Qing dynasty and exacerbated China's internal problems, but also caused a national humiliation that had a lasting impact on China's collective consciousness. This ultimately contributed to the emergence of modern nationalism in China and the fall of the Qing dynasty in 1911.


From the end of the 19th century, the great powers began to export their rivalries and conflicts to different parts of the world, including Asia, Africa and the Pacific. This led to clashes and colonial wars, where European powers fought for territorial dominance, access to resources and political influence in these regions. However, South America was considered a "reserved area" by the United States, which sought to expand its influence in the region and prevent other powers from establishing themselves there. This "Monroe Doctrine" policy was enunciated by US President James Monroe in 1823, and it served as the basis for US foreign policy in Latin America during the 19th and 20th centuries.
South America was seen as a kind of exclusion zone for European powers because of the Monroe Doctrine, which was a policy of the US administration to prevent European powers from interfering in the affairs of the Western Hemisphere. In enunciating the Monroe Doctrine in 1823, President James Monroe declared that the United States would regard any European intervention in the affairs of America's independent nations as an unfriendly act against the United States. This doctrine served as the basis for US foreign policy in Latin America for over a century and has been invoked on several occasions to justify US intervention in regional affairs. By contrast, in other parts of the world, such as Africa, Asia and the Pacific, the European powers have been much more active in establishing colonies and spheres of influence, often at the expense of local populations. This has often led to conflicts and rivalries between these powers, which have been a major source of instability and international tension.


= The establishment of Alliance Systems =
= Establishing Alliance Systems =
The establishment of alliance systems contributed to the disintegration of international political conditions in the early 20th century. The major European powers grouped themselves into two main alliance blocs: the Triple Entente (France, UK, Russia) and the Triple Alliance (Germany, Austria-Hungary, Italy). This polarisation led to increased tensions between the two blocs, with heightened economic, military and colonial rivalries.
At the beginning of the 20th century, the alliance system played a crucial role in the development of the international political situation. The emergence of the Triple Entente and the Triple Alliance created a political and military polarisation in Europe, with two blocs of powers facing each other. The Triple Entente, formed by France, Russia and the United Kingdom, sought to counter the perceived threat of the Triple Alliance, made up of Germany, Austria-Hungary and Italy. However, it is important to note that Italy had a somewhat ambiguous position, having signed a secret alliance with France in 1902. The system of alliances intensified rivalries between these powers and contributed to an atmosphere of mistrust and suspicion. Each side sought to strengthen its own military capabilities to protect itself against possible aggression from the other. In addition, colonial disputes and imperialist ambitions also fuelled tensions between these powers. Ultimately, these rising tensions led to the First World War in 1914, when the assassination of Archduke Franz Ferdinand of Austria in Sarajevo triggered a series of events that dragged most of the major European powers into the conflict.


The alliance systems also contributed to the broadening and internationalisation of conflicts, as happened in the First World War. When the war broke out, alliances led to a general mobilisation of many countries, beyond the initial confrontation between Germany and France. The war spread across Europe and beyond, involving many countries and resulting in the deaths of millions.
The alliance system played a major role in the expansion of the First World War. When a conflict broke out between a Triple Entente power and a Triple Alliance power, it quickly led to the involvement of all the powers of both alliances. The assassination of Archduke Franz Ferdinand of Austria in June 1914 by a Serbian nationalist served as the detonator. Austria-Hungary, supported by Germany, declared war on Serbia. Russia, Serbia's ally, then went to war against Austria-Hungary. France and the United Kingdom, Russia's allies in the Triple Entente, soon declared war on Germany and Austria-Hungary. Italy, despite its membership of the Triple Alliance, chose to remain neutral before joining the Entente in 1915. Other countries, such as the Ottoman Empire (allied with Germany) and Japan (allied with the United Kingdom), also became involved in the conflict. In 1917, the United States entered the war on the side of the Entente. The war quickly became a global conflict, making the First World War one of the most destructive wars in history. Millions of people were killed and many parts of the world were ravaged.


== The Role and Impact of the Triple Alliance ==
== The Role and Impact of the Triple Alliance ==
[[File:Triple Alliance.png|thumb|right|Triple Alliance|The Triple Alliance between Germany, Austria-Hungary and Italy.]]
[[File:Triple Alliance.png|thumb|right|Triple Alliance|La Triple Alliance entre l'Allemagne, l'Autriche-Hongrie et l'Italie.]]
 
The term "duplicity" is used to refer to the alliance between Germany and Austria-Hungary that existed before the First World War.


The term "duplicity" was used to refer to the alliance between Germany and Austria-Hungary. The term comes from the Latin "duplex", which means "double" or "consisting of two parts". The alliance was also known as the "Three Emperors' Alliance", as it was initiated by German Emperor Wilhelm II, Austro-Hungarian Emperor Franz Joseph and Russian Tsar Nicholas II when they met in Skierniewice, Poland, in September 1884. However, this alliance ended in 1890 when Wilhelm II renewed the treaty of reassurance with Russia.
The Three Emperors Alliance, which included Germany, Austria-Hungary and Russia, was signed in 1873. However, this alliance was not renewed in 1887 due to growing disputes between Russia and Austria-Hungary. In 1879, Germany and Austria-Hungary formed the Duplice, a secret alliance aimed at countering Russia's growing influence in Eastern Europe. Italy joined this alliance in 1882, creating the Triple Alliance. The Treaty of Reassurance, signed in 1887, was a separate agreement between Germany and Russia. This agreement helped to maintain peace between the two countries, despite their belonging to different alliance systems. However, this treaty was not renewed in 1890, which eventually led to estrangement between Russia and Germany and an approach between Russia and France, culminating in the formation of the Franco-Russian Alliance in 1894.


The alliance between Germany and Austria-Hungary, also known as the "duplicity", was concluded in 1879 by a treaty of friendship and alliance. At the time, the two countries were in competition to achieve the unity of the German-speaking peoples in Central Europe, but they came to recognise their common interests in the face of common threats. This alliance was strengthened over the years, with the participation of Italy in 1882 to form the Triple Alliance.
The alliance between Germany and Austria-Hungary, known as the Duplice, was signed in 1879. The alliance was partly born out of a shared fear of Russian expansion in Europe. Both were worried about the possibility of war on two fronts: Germany feared a confrontation with France and Russia, while Austria-Hungary was concerned about Russia and Italy. By entering into this alliance, they hoped to discourage such a situation. In 1882, Italy joined the alliance, which then became the Triple Alliance. Italy was motivated by the fear of French expansion in North Africa and sought the support of Germany and Austria-Hungary for its own colonial ambitions. However, it should be noted that Italy's commitment to the alliance was less solid, as Italy had unresolved territorial claims against Austria-Hungary. When the First World War broke out, Italy initially declared its neutrality, before joining the Allies in 1915 following the signing of the Pact of London, which promised Italy territorial gains after the war.


The 1881 treaty between Germany, Austria-Hungary and Russia did not work because the interests of the three powers diverged. Russia wanted to protect the Slavs in the Balkans, which was contrary to the interests of Austria-Hungary, which wanted to control the region. In 1882, a new treaty was signed between Germany, Austria-Hungary and, this time, Italy, forming the Triple Alliance. This treaty was designed to counter the Triple Entente formed by France, Russia and Great Britain, and guaranteed military assistance in the event of aggression by one of the signatory powers.
The 1881 agreement uniting Germany, Austria-Hungary and Russia failed to last, due to divergent interests between the three nations. Russia, which saw itself as the protector of the Slavic peoples in the Balkans, came into conflict with the ambitions of Austria-Hungary, which aspired to hegemony in the same region. Faced with this impasse, a new pact was formed in 1882, this time between Germany, Austria-Hungary and Italy, giving rise to the Triple Alliance. This treaty was intended to counterbalance the Triple Entente, an alliance made up of France, Russia and Great Britain. It also stipulated that each signatory would provide military support to the others in the event of external aggression.


Italy had colonial ambitions in North Africa and Tunisia was one of the areas it coveted. In 1882, Italy joined the Double Alliance between Germany and Austria-Hungary, which then became the Triple Alliance. This treaty stipulated that the three countries would assist each other in the event of an attack by a fourth power and remain neutral in the event of an attack on one of the members by a non-signatory power. Italy had thus found allies to help it realise its colonial ambitions in North Africa.
Italy's entry into the Triple Alliance marked an important milestone in the country's history, as it was the first time it had participated in such a collective security agreement with major European powers. Italy, newly unified and relatively weak compared to other great powers, was looking for powerful allies to protect its interests, and Germany and Austria-Hungary offered that security. Moreover, Italy's membership of the Triple Alliance was part of a wider strategy of colonial expansion. At the end of the nineteenth century, Italy was seeking to establish its own colonial empire, mainly in North Africa. Tunisia, just across the Mediterranean from Sicily, was a particularly attractive target for Italy. However, France also had its eye on Tunisia, which led to tensions with Italy. Therefore, by joining the Triple Alliance, Italy hoped to gain the support of Germany and Austria-Hungary to counter French influence in Tunisia and other parts of North Africa. However, Italy's colonial ambitions in North Africa met with considerable resistance, particularly from France, and led to tensions within the Alliance.


Italy actually signed a secret agreement with Germany and Austria-Hungary in 1882, which formed the Central Powers Alliance. However, during the First World War, Italy switched sides and joined the Triple Entente in 1915, having signed secret agreements with France and Britain in 1915.
Italy was part of the Triple Alliance with Germany and Austria-Hungary, but its participation in the alliance was complex and fraught with contradictions. In 1882, Italy had joined the Triple Alliance in an attempt to protect itself against possible French aggression and to gain support for its colonial ambitions. However, Italy also had many differences with its allies, in particular with Austria-Hungary, which controlled territories that Italy considered to be part of its "irredent Italy", notably Trentino and South Tyrol. At the start of the First World War, Italy chose to remain neutral, arguing that the Triple Alliance was essentially a defensive alliance, and that since Austria-Hungary had been the aggressor by declaring war on Serbia, Italy was not obliged to support it. Italy was subsequently lured to the side of the Triple Entente (France, the United Kingdom and Russia), which promised significant territorial gains in Austria-Hungary as part of the London Accords of 1915. When Italy entered the war on the side of the Triple Entente in May 1915, it marked a major reversal of alliances in Europe and further widened the scope of the war. It also showed how alliances could be subject to rapid change depending on circumstances and perceived opportunities.


The Central Powers included Germany, Austria-Hungary, and Italy. This bloc was mainly located in Central and Eastern Europe, hence its name. The Central Powers were in opposition to the Triple Entente, which consisted of France, Great Britain, and Russia. The First World War was thus marked by the confrontation of these two rival blocs.
The First World War was fought between two major blocs: the Central Powers and the Triple Entente. The Central Powers, sometimes referred to as the Central Empires, consisted mainly of the German Empire, the Austro-Hungarian Empire and, initially, the Kingdom of Italy. However, as discussed earlier, Italy left this alliance in 1915 to join the side of the Triple Entente. Other notable members of the Central Powers were the Ottoman Empire and the Kingdom of Bulgaria. The Triple Entente was formed by the French Republic, the United Kingdom and the Russian Empire. As the war progressed, other nations, including Italy, Japan and the United States, joined their cause. The resulting conflict was a total war that involved not only military forces but also civilian populations, and had repercussions on every aspect of society. It also led to the fall of the German, Austro-Hungarian, Russian and Ottoman empires, and redrawn the political map of Europe and the Middle East.


== The Formation and Influence of the Triple Entente ==
== The Formation and Influence of the Triple Entente ==
[[File:Triple Entente.jpg|thumb|200px|alt=Triple Entente.jpg]]
[[File:Triple Entente.jpg|thumb|200px|alt=Triple Entente.jpg]]


There was no formal treaty between the countries of the Triple Entente (France, UK, Russia). However, there were informal agreements and mutual commitments that strengthened their alliance. For example, France and Russia had signed a military agreement in 1892 which provided for mutual aid in the event of an attack by Germany or Austria-Hungary. Similarly, the United Kingdom signed a series of agreements with France in the early 20th century to strengthen their military and naval cooperation in the Mediterranean and Africa. These agreements and mutual commitments led to growing solidarity between the countries of the Triple Entente, even in the absence of a formal treaty.
Although the Triple Entente was not a formal military alliance like the Triple Alliance, it did serve to unite France, Russia and the United Kingdom against the threat of the Central Powers. The Entente Cordiale between France and the United Kingdom in 1904 improved relations between the two countries, which had historically been fraught with colonial rivalries. This agreement mainly resolved colonial disputes in North Africa, leading to greater cooperation between the two nations. At the same time, France and Russia signed a series of agreements between 1891 and 1894, culminating in the Franco-Russian Alliance. These agreements included a mutual assistance clause in the event of an attack by Germany or one of its allies. The United Kingdom, having resolved its colonial differences with France and watched the German threat grow, signed an agreement with Russia in 1907, known as the Anglo-Russian Convention. This agreement resolved their differences in Central Asia and strengthened anti-German sentiment among the three countries. These agreements helped to create a climate of mutual trust and cooperation between the three countries, strengthening their ability to respond collectively to the threat from the Central Powers.
 
The Franco-Russian Alliance, concluded in 1892 and officially ratified in 1894, was an essential pivot in the foreign policy of these two countries. Indeed, it was of vital importance in the run-up to the First World War. Economically, the alliance was beneficial to both sides. France was a major investor in Russia, providing financial support for the country's industrial and railway development. In return, Russia offered a vast market for French goods and services. On the military front, the treaty stipulated mutual assistance in the event of an attack by Germany or one of its allies. This provision reflected growing concerns about Germany's growing power in the European context. Diplomatically, the alliance helped to break France's international isolation following its defeat in the Franco-Prussian War of 1870-1871. For Russia, the alliance brought it closer to Western Europe. The Franco-Russian alliance was renewed in 1899 and continued until the First World War, when it played a key role in the outbreak of the conflict.


In 1892, a Franco-Russian treaty strengthened economic ties. In 1892, France and Russia signed a treaty of alliance which strengthened the economic, military and diplomatic ties between the two countries. This treaty was renewed in 1894 for a period of 10 years, then in 1904 for an unlimited period. The Triple Entente was completed by the Entente Cordiale, an agreement between France and the United Kingdom in 1904, which put an end to decades of mistrust between the two countries. The agreement included the recognition of France's sphere of influence in Morocco and the UK's sphere of influence in Egypt. The agreement was concluded between the UK and Russia to resolve their differences in Central Asia and Persia. It also provided for cooperation in the event of aggression by Germany or Austria-Hungary against one of the signatories. The Triple Entente thus consisted of France, Russia and the United Kingdom, and was directed against Germany and the Austro-Hungarian Empire.
The Entente Cordiale of 1904 marked a key stage in the improvement of relations between France and the United Kingdom, putting an end to centuries of colonial rivalry and mistrust. The UK's recognition of France's sphere of influence in Morocco and France's recognition of the UK's sphere of influence in Egypt was a major step in consolidating this new friendly relationship. In 1907, the Entente Cordiale was extended with the addition of Russia, forming the Triple Entente. This agreement between Russia and the United Kingdom was designed to resolve their differences in Central Asia and Persia. It also provided for cooperation in the event of aggression by Germany or Austria-Hungary against one of the signatories. This series of agreements thus created a solid alliance between these three major powers, which ultimately played a key role in the outbreak of the First World War. The main objective of this alliance was to counter the growing threat posed by Germany and Austria-Hungary in the European context of the time. The Triple Entente therefore comprised France, Russia and the United Kingdom, and was directed against Germany and the Austro-Hungarian Empire.


The Anglo-Russian agreement of 1907 resolved the differences between the two powers in the Far East, including Tibet. The British agreed to recognise Russia's political and economic interest in the region, while the Russians agreed not to interfere with British interests in India. This allowed the formation of the Triple Entente with France, which was already linked to Russia by a treaty of alliance.
The Anglo-Russian agreement of 1907 represented a major turning point in relations between the United Kingdom and Russia, two powers that had had major disputes in the Far East, particularly over Iran, Afghanistan and Tibet. These territories were seen as strategic buffers by the British, who wanted to protect their colonial jewel, India, from Russian ambitions. Under this agreement, the two countries succeeded in establishing zones of influence in Iran, recognised the independence of Afghanistan and agreed not to intervene in Tibet. The British recognised Russian political and economic interests in Iran, while the Russians undertook not to interfere with British interests in India. The easing of tensions between Russia and the United Kingdom paved the way for the formation of the Triple Entente, which also included France. This alliance was fundamental to the balance of power in Europe on the eve of the First World War.


The military agreement between Britain and Japan was signed in 1902, before the formation of the Triple Entente. This agreement was intended to protect the two countries' common interests in Asia against Russia and to ensure the security of their respective possessions in the region. It was renewed in 1905 and 1911, and helped strengthen Britain's influence in the region and weaken Russia's position in the Far East. Japan also played a key role in the Russo-Japanese War of 1904-1905, which saw the defeat of Russia and the strengthening of Japan's position in Asia.
Great Britain and Japan concluded a naval agreement in 1902, known as the Anglo-Japanese Alliance. This agreement was motivated by the desire of these two powers to stem Russian expansion in the Far East, more specifically in the region of Manchuria and Korea. Under the terms of the agreement, if either party was at war with two or more powers, the other party would have to come to its aid. In addition, each party undertook to remain neutral if the other was at war with another power. The renewal of the Anglo-Japanese Alliance in 1905 and 1911 marked an important stage in Britain's foreign policy in the Far East, as it not only strengthened its position in the region, but also weakened Russia. The agreement also played a crucial role in the Russo-Japanese War of 1904-1905, in which Japan emerged victorious, strengthening its position in Asia and asserting its status as a world power.


The existence of the alliance agreements led to an escalation of tensions and polarisation between the two alliance blocs. Countries felt obliged to support each other if they went to war, even if the reasons for a country going to war were not always clear or justified. The assurance of military support led some countries to adopt a more aggressive attitude and to take risks that eventually led to war. For example, Germany took the risk of declaring war on France and Russia in 1914 because of its alliance with Austria-Hungary, even though the reasons for the war were unclear and Germany was not directly threatened.
The existence of these alliances played a major role in the escalation of tensions at the beginning of the 20th century. The mutual obligation to defend one's allies created a kind of constant pressure and tension, where every aggressive act or political move was scrutinised through the prism of these alliances. This pressure led to an arms race and military escalation that paved the way for the First World War. The situation was further complicated by the complex and sometimes secretive nature of these alliances. For example, the outbreak of the First World War was largely caused by the assassination of Archduke Franz Ferdinand of Austria in Sarajevo in 1914. Because of its alliance obligations with Austria-Hungary, Germany declared war on Russia and France. This set off a chain reaction, with each country declaring war on those who threatened their allies, ultimately leading to a world war. This situation was also exacerbated by the bellicose and expansionist attitude of certain powers, notably Germany. Feeling that it had the support of its allies, Germany adopted an aggressive foreign policy, which helped to increase tensions. So the alliance systems, while intended to preserve peace by ensuring a balance of power, actually contributed to the escalation of tensions and ultimately led to war.


= The First World War: The Suicide of Europe =
= The First World War: The Suicide of Europe =


The First World War, which lasted from 1914 to 1918, was a devastating global conflict that resulted in the deaths of millions of people and caused massive destruction in many parts of the world. It was triggered by a series of political, economic and territorial tensions between the major European powers, and ultimately led to the formation of two opposing camps: the Allies (the United Kingdom, France, Russia and the United States, among others) and the Central Empires (Germany, Austria-Hungary and the Ottoman Empire, among others).
The First World War is considered to be one of the deadliest conflicts in history, with an unprecedented scale of destruction. The conflict began with the assassination of Archduke Franz Ferdinand of Austria-Hungary in Sarajevo in June 1914, an event that triggered a series of military mobilisations and declarations of war between the major European powers due to their respective systems of alliances. The United Kingdom, France and Russia formed the Allies, also known as the Triple Entente. Other nations, including Italy, Japan and, later, the United States, joined the Allies during the war. On the other hand, Germany, Austria-Hungary and the Ottoman Empire formed the Central Empires, sometimes referred to as the Central Powers. These two blocs fought on several fronts, including the Western Front in France and Belgium, the Eastern Front in Russia, and several other fronts in Italy, the Balkans and the Middle East. The war was characterised by trench warfare, a military tactic where both sides fought from fortified trenches and where advances were often measured in metres despite massive casualties. The war also saw the use of new technologies and weapons, including heavy artillery, aircraft, tanks, submarines and poison gas. These innovations contributed to the massive loss of life and destruction of civilian infrastructure. The First World War ended on 11 November 1918 with the signing of the armistice. The consequences of the conflict were profound, with the redrawing of the map of Europe, the collapse of the central empires, the emergence of new states and the establishment of the Treaty of Versailles, which laid the foundations for the Second World War a few decades later.


The conflict broke out in 1914, after the assassination of Archduke Franz Ferdinand of Austria-Hungary in Sarajevo by a Serbian nationalist. Alliances and rivalries between the major European powers quickly led to military escalation, with Germany, Austria-Hungary, the Ottoman Empire and Bulgaria entering the war against the Allies (United Kingdom, France, Russia, Italy, Japan and the United States).
The assassination of Archduke Franz Ferdinand on 28 June 1914 is often cited as the event that sparked off the First World War. However, it was not the assassination itself that caused the war, but rather the way in which different nations reacted to the event. Austria-Hungary, having been assured of German support, declared war on Serbia, accused of complicity in the assassination. Russia, which saw itself as the protector of the Slavic peoples, including the Serbs, began to mobilise its army in support of Serbia. Germany, as an ally of Austria-Hungary, declared war on Russia and subsequently on France, Russia's ally. When Germany invaded Belgium to attack France from the north, the violation of Belgian neutrality led the United Kingdom to declare war on Germany. Other countries were drawn into the conflict because of their respective alliances or their own imperialist interests, turning the war into a global conflict. The conflict lasted from 1914 to 1918, involving more than 30 nations and causing the deaths of millions of people. It radically transformed the political and social order of the world and laid the foundations for the tensions and conflicts that dominated the twentieth century.


The consequences of the First World War were disastrous for Europe and the world. Millions of people died, both in the fighting and in the indirect consequences of the conflict, such as famine and disease. Vast territories were devastated, economies were ruined and societies were disrupted.
The consequences of the First World War were profoundly destructive and transformed the world in an unprecedented way. The loss of life was enormous: around 10 million soldiers were killed and millions more were wounded. The number of civilians killed or injured as a direct result of the war is difficult to quantify, but is estimated to be in the millions. The Spanish flu epidemic of 1918, aggravated by the displacement of populations during the war, also caused the deaths of tens of millions of people around the world. Beyond the human losses, the economic and social costs of the war were enormous. European countries, in particular, saw their infrastructures destroyed and their economies ruined. War debts burdened economies for decades. Societies were also profoundly disrupted: millions of people were displaced, political regimes were overthrown and old social hierarchies were challenged. Politically, the war led to the end of the great European empires (Russian, German, Ottoman and Austro-Hungarian) and the creation of new nations, redrawing the map of Europe and the Middle East. In addition, the Treaty of Versailles, which officially ended the war in 1919, created tensions and resentments, particularly in Germany, which contributed to the rise of fascism and ultimately to the Second World War. Finally, the First World War also had profound cultural and psychological consequences. It called into question the ideals of progress and civilisation that had prevailed before the war, and led to a reconsideration of reason and morality.


The war was characterised by fierce fighting on wide fronts, increasingly sophisticated military technology, massive loss of life and inhuman living conditions for soldiers and civilians. The battles of Verdun, the Somme and Passchendaele are examples of the horror of trench warfare that marked the conflict.
Perhaps the most striking features of the First World War were trench warfare and the intensive use of new military technologies. Trench warfare was a defensive strategy in which both sides dug and occupied a complex network of trenches, hoping to protect their troops while blocking the enemy's advance. Living conditions in these trenches were atrocious: cold, rain, mud, vermin, disease, and the constant danger of enemy fire and artillery attacks. In addition, offensives to take control of enemy trenches were often disastrous, causing huge casualties for minimal territorial gains. The battles of the Somme and Verdun, among the deadliest in human history, are perfect examples of these disastrous offensives. The First World War also saw the use of new military technologies on an unprecedented scale. Artillery was improved, with the introduction of the fragmentation shell and the massive use of heavy artillery. Machine guns, tanks, military aircraft, submarines and even chemical weapons were used on a large scale for the first time. These technological innovations helped to increase the lethality of the conflict, but they also led to a war of attrition, with each side trying to exhaust the other through massive losses rather than decisive victories. Ultimately, the First World War revealed the true horror of modern industrial warfare, with its millions of dead, devastated landscapes and lasting psychological trauma.


The First World War also had lasting geopolitical consequences. The German, Austro-Hungarian and Ottoman empires collapsed, leaving new states in place. Russia underwent a revolution that led to the creation of the Soviet Union, while Europe experienced a period of political and economic instability that contributed to the rise of authoritarian and fascist regimes.
The First World War had a major geopolitical impact, redrawing the map of Europe and the Middle East. The collapse of the central empires led to the creation of many new states. The Treaty of Versailles, which officially ended the war, imposed severe sanctions on Germany and redrawn the borders of Europe. The German Empire was dismantled, losing much of its territory to the victors. The Austro-Hungarian Empire was divided into several nation states, including Austria, Hungary, Czechoslovakia and Yugoslavia. The Ottoman Empire, defeated and occupied, was divided between the victorious powers with the Treaty of Sèvres in 1920, leading to the creation of new states in the Middle East, such as Iraq and Syria. However, the resistance led by Mustafa Kemal Atatürk in Turkey led to the Turkish War of Independence and the creation of the modern Republic of Turkey. In Russia, the collapse of the Eastern Front led to the Russian Revolution of 1917, which overthrew the Tsarist regime and established a Communist government, leading to the creation of the Soviet Union. These radical changes destabilised the political and social order in Europe and the Middle East. Tensions between the new states and unresolved grievances from the war contributed to the rise of authoritarian and fascist regimes, ultimately leading to the Second World War.


== Escalating tensions: Preamble to the Conflict ==
== Escalating tensions: Preamble to the Conflict ==
The crisis of the summer of 1914 was only the latest in a series of increasingly severe crises. First there was the Moroccan crisis, which led to the Algeciras conference, then the Italian invasion of Libya in 1911, which shook the European balance, because everything that touched the Ottoman Empire triggered tensions; then the Balkan wars in 1912 - 1913, which were a prelude to the First World War.  
The run-up to the First World War was marked by a series of international crises and local conflicts that exacerbated tensions between the major European powers and undermined the stability of the international system at the time. The first Moroccan crisis in 1905-1906 arose when Germany challenged France's ambitions in Morocco, causing international tension that was resolved by the Algeciras Conference. This conference resulted in an agreement that recognised Morocco as a free state but confirmed France's effective control over the country, which was seen as a defeat for Germany. Italy's invasion of Libya in 1911 marked an escalation in international tensions. Libya was then a province of the Ottoman Empire, and the Italian invasion triggered an international crisis because of the implications for the balance of power in the Mediterranean and the Middle East. The Balkan Wars of 1912-1913 further exacerbated tensions. They were triggered by a series of conflicts between several Balkan states (Serbia, Bulgaria, Greece and Montenegro) and the Ottoman Empire. These wars challenged the balance of power in the region and created a climate of mistrust and animosity, particularly between Serbia and Austria-Hungary. These crises not only exacerbated the rivalries between the great powers, but also highlighted the weaknesses of the alliance system of the time and the limits of diplomatic mechanisms for resolving conflicts. They helped to create a climate of tension and mistrust that eventually led to the outbreak of the First World War in 1914.  


From the 20th century onwards, there is a series of crises that generate tensions between the European powers. The blocs were in opposition and embarked on an "arms race", while alliances extended to many other countries, completing the blocs and crystallising oppositions. Following the Balkan wars, which it had provoked and lost, Bulgaria, which had previously been allied with Serbia, joined the 'triple alliance', while Greece sided with the 'triple entente'.
The twentieth century began with a series of international crises that exacerbated tensions between the great European powers. Colonial, economic and military rivalries led to an arms race and an increasing polarisation of international politics, with two major alliance blocs emerging. The Triple Alliance, formed by Germany, Austria-Hungary and Italy, and the Triple Entente, formed by France, the United Kingdom and Russia, were strengthened by the accession of other countries. Bulgaria, disappointed by the outcome of the Balkan wars, chose to ally itself with the Triple Alliance. On the other hand, Greece, which had benefited from these wars to expand its territory, drew closer to the Triple Entente. The complexity and interconnectedness of these alliances not only crystallised oppositions, but also created a climate of uncertainty and mistrust that ultimately led to the outbreak of the First World War. The alliances forced countries to support each other in the event of war, even if the reasons for the conflict were not always clear or directly linked to their interests. In addition, the arms race raised the stakes and created an atmosphere of tension and anticipation of inevitable war.


== From Local Crisis to Igniting European War ==
== From Local Crisis to the Flame of European War ==


=== The Assassination of Archduke Franz Ferdinand: The Initial Fuse ===
=== The Assassination of Archduke Franz Ferdinand: The Initial Fuse ===
The Sarajevo bombing is considered the triggering event of the First World War. On 28 June 1914, Archduke Franz Ferdinand, heir to the throne of Austria-Hungary, was assassinated in Sarajevo, the capital of Bosnia-Herzegovina, by a young Serbian nationalist named Gavrilo Princip. Gavrilo Princip was a Serbian nationalist born on 25 July 1894 in Obljaj, in what was then the province of Bosnia and Herzegovina of the Austro-Hungarian Empire (now Bosnia and Herzegovina). He is best known for the assassination of Archduke Franz Ferdinand, heir to the throne of Austria-Hungary, in an attack in Sarajevo on 28 June 1914. Princip was a member of an underground group called the 'Black Hand', which sought to promote the independence of Bosnia and Herzegovina from the Austro-Hungarian Empire and its attachment to Serbia. He had received military training in Serbia before returning to Bosnia to participate in the attack. On 28 June 1914, Princip and several other members of the Black Hand attacked the car of Archduke Franz Ferdinand while he was visiting Sarajevo. Princip managed to shoot the Archduke and his wife, Sophie, with a pistol. This event triggered a series of alliances and reactions that eventually led to military escalation and the outbreak of the First World War. After the attack, Princip was arrested and imprisoned. He was tried and sentenced to 20 years in prison for his role in the assassination of the Archduke. He died in prison in 1918, at the age of 23, of tuberculosis.
The attack that took place in Sarajevo on 28 June 1914 is widely recognised as the catalyst that plunged the world into the First World War. On that day, Archduke Franz Ferdinand, the heir apparent to the Austro-Hungarian throne, was tragically killed in Sarajevo, the capital of Bosnia-Herzegovina, by Gavrilo Princip, a young Serb nationalist. Born on 25 July 1894 in Obljaj, then part of the Bosnian province of the Austro-Hungarian Empire and now in Bosnia-Herzegovina, Princip was a fervent supporter of Serbian nationalism. He is best known for the tragic assassination of Franz Ferdinand in Sarajevo. An active member of the "Black Hand", a clandestine organisation advocating the independence of Bosnia-Herzegovina and its integration into Serbia, Princip had undergone military training in Serbia before returning to Bosnia to orchestrate the attack. On the fateful day, 28 June 1914, Princip, along with several other members of the Black Hand, managed to approach Archduke Franz Ferdinand's car during his visit to Sarajevo. He then shot the Archduke and his wife, Sophie, with a pistol. This set off a chain reaction of alliances and reprisals that led to military escalation and, ultimately, the outbreak of the First World War. After the attack, Princip was arrested and imprisoned. Tried for his role in the assassination of the Archduke, he was sentenced to 20 years in prison. However, he did not have to serve the full sentence, dying in prison in 1918, aged just 23, of tuberculosis.
 
The Sarajevo bombing triggered a cascade of diplomatic and military reactions that led to war in Europe. After the assassination of Archduke Franz Ferdinand, Austria-Hungary pointed the finger at Serbia, accusing it of having orchestrated the crime, and demanded reparations. This accusation was not unfounded. Since the 1870s and 1880s, Serbia had been a thorn in the side of the Austro-Hungarian Empire. At that time, Serbia had embarked on a campaign to unify the Slavic peoples of the southern Balkans, a region that included populations under Austro-Hungarian rule. This unification movement was perceived by the Austro-Hungarian Empire as a direct threat to its territorial integrity and stability. Fear that their empire would disintegrate as a result of the rise of Slav nationalism prompted the Austro-Hungarian rulers to take retaliatory measures against Serbia after the assassination of the Archduke. This tension between the two nations was one of the main triggers for the escalation that led to the First World War.
 
The annexation of Bosnia-Herzegovina by Austria-Hungary in 1908 aggravated tensions with Serbia. This province, under Austro-Hungarian protectorate since the Congress of Berlin in 1878, was mainly populated by South Slavs, an ethnic group to which the Serbs also belonged. The Serbs aspired to the integration of these regions into a "Greater Serbia", an idea fuelled by the current of Panslavism. The official annexation of Bosnia-Herzegovina by Austria-Hungary was perceived by Serbia as a violation of their national ambitions. Moreover, the annexation was seen as a direct threat to Serbia, as it gave Austria-Hungary a common border with the kingdom. In response, Serbia increased its support for the nationalist movements active in the Austro-Hungarian regions populated by South Slavs, further exacerbating tensions with the Austro-Hungarian Empire. These growing tensions played a crucial role in the outbreak of the First World War.
 
The assassination of Archduke Franz Ferdinand in 1914 by Gavrilo Princip, a Serbian nationalist, set off a firestorm in an already tense Europe. Perceived by Austria-Hungary as a direct affront, this act triggered an ultimatum to Serbia, demanding reparations and guarantees. However, Serbia refused to comply fully with Austro-Hungarian demands, prompting Austria-Hungary's declaration of war on Serbia on 28 July 1914. The complex system of military alliances between the great European powers quickly transformed this regional conflict into a global conflagration. Germany, linked to Austria-Hungary by the Triple Alliance, declared war on Russia and France, Serbia's allies. Similarly, the Ottoman Empire and Bulgaria, with their own agreements with Germany and Austria-Hungary, went to war against the Allies - the United Kingdom, France, Russia, Italy, Japan and later the United States. Thus began the First World War, a large-scale conflict that reshaped the world as we know it.


This event triggered a series of alliances and reactions that eventually led to military escalation and the outbreak of war in Europe. Austria-Hungary accused Serbia of being behind the assassination of Franz Ferdinand and demanded reparations. Serbia had been seen as a source of tension for the Austro-Hungarian Empire since the 1870s-1880s. At that time, Serbia sought to unify the Slavic populations of the southern Balkans, including those under Austro-Hungarian rule. This policy was seen as a threat by the Austro-Hungarian rulers, who feared losing their influence over the Slavic populations and seeing their empire break up.
The assassination of Archduke Franz Ferdinand was merely the spark that ignited a powder keg prepared by years of simmering tensions. The breeding ground for the First World War was much deeper and more complex, rooted in a series of interconnected factors. Nationalism, for example, was a major factor. In many parts of Europe, particularly the Balkans and parts of the Austro-Hungarian Empire, nationalist movements sought to create unified nation states for their peoples. This nationalism was sometimes accompanied by anti-imperialist sentiments and a desire for freedom from foreign domination. Imperialism also played a crucial role. The great European powers were engaged in a race for colonial expansion throughout the world, which exacerbated rivalries and tensions between them. Competition for resources, markets and prestige created a climate of mistrust and animosity. Finally, internal economic and political tensions also contributed to the march towards war. Rapid economic change exacerbated inequalities and social tensions in many countries, while rigid political structures often failed to respond to demands for reform. Although the assassination of Franz Ferdinand was the immediate catalyst for the war, its root causes were deeply rooted in the social, political and economic structures of the time.[[fichier:Frontouest1914gf.gif|right|thumb|350px|The Western Front between 1915 and 1916 - [http://www.atlas-historique.net/1914-1945/cartes/FrontOuest1915-16.html atlas-historique.net]]]


In 1908, Austria-Hungary annexed Bosnia-Herzegovina, a Slavic-majority province that had been under protectorate since 1878. This decision was not welcomed by the Serbs, who considered Bosnia and Herzegovina to be part of their sphere of influence. Tensions between Serbia and Austria-Hungary intensified, especially after Serbia began to support nationalist movements in the Austro-Hungarian provinces populated by South Slavs.
=== Chronology of the events of the First World War ===
The fateful act of 28 June 1914 in Sarajevo, when Archduke Franz Ferdinand of Austria-Hungary was assassinated, is widely recognised as the trigger for the First World War. This dramatic event triggered an international crisis with fatal consequences, exacerbating already existing tensions between the European powers and provoking a cascade of military and political alliances that ultimately plunged the world into global conflict. Gavrilo Princip, the young man who carried out the assassination, was a fervent Serbian nationalist. His convictions were so deep that he had forged links with the secret radical group known as the Black Hand. This terrorist group, whose aim was the liberation of the southern Slavs from Austro-Hungarian rule, was the catalyst that enabled Princip to carry out his destructive act.


The assassination of Archduke Franz Ferdinand in 1914, which was organised by Serbian nationalists, was seen as a provocation by Austria-Hungary, which demanded reparations from Serbia. This led to a series of alliances and reactions that eventually led to military escalation and the outbreak of the First World War. Serbia refused to submit to Austrian demands, which led to a declaration of war by Austria-Hungary against Serbia on 28 July 1914. Alliances between the major European powers quickly led to military escalation, with Germany, Austria-Hungary, the Ottoman Empire and Bulgaria entering the war against the Allies (the United Kingdom, France, Russia, Italy, Japan and the United States).
The assassination of Archduke Franz Ferdinand led Austria-Hungary to issue a stern ultimatum to Serbia on 23 July 1914. This ultimatum demanded a thorough investigation into possible Serbian involvement in the assassination, as well as the cessation of all hostile activities against Austria-Hungary on Serbian soil.


Although the assassination of Archduke Franz Ferdinand is seen as the trigger for the war, the root causes of the conflict were much more complex and deep-seated, with factors such as nationalism, imperialism and economic and political tensions between the major European powers.
Although Serbia agreed to the majority of these demands, it refused to comply with all of Austria-Hungary's requests. This led Austria-Hungary to declare war on Serbia on 28 July 1914, triggering a series of events that rapidly amplified existing tensions and activated the networks of alliances between the various powers, ultimately leading to the global outbreak of the First World War. Following Austria-Hungary's declaration of war on Serbia on 28 July 1914, alliances were formed and one country after another declared war on another. Germany declared war on Russia on 1 August 1914, then on France the following day, prompting the United Kingdom to enter the war in support of France. Many other countries subsequently joined the conflict, including Italy, Japan, the United States and the Ottoman Empire. By mid-August 1914, most of the major European powers were involved in the conflict.


[[file:Frontouest1914gf.gif|right|thumb|350px|The Western Front between 1915 and 1916 - [http://www.atlas-historique.net/1914-1945/cartes/FrontOuest1915-16.html atlas-historique.net]]
After declaring war on France on 3 August 1914, Germany launched a rapid offensive through Belgium, aimed at neutralising France before potential reinforcements arrived. However, this lightning advance was halted by the resistance of French and British forces, culminating in the Battle of the Marne, which took place from 6 to 12 September 1914. This battle was one of the most significant confrontations of the First World War. It enabled the Allies to effectively repel the German forces and prevent the capture of Paris. However, contrary to initial expectations of a short war, the conflict became bogged down and lasted four more years, with a catastrophic human and material toll.


=== Key Chronology of Events Precipitating the ===
After the Battle of the Marne in September 1914, despite their desire to advance towards Germany, the French and British forces faced determined resistance from the German armies. The Germans succeeded in withdrawing and fortifying themselves in strategic defensive positions stretching from the North Sea through Belgium and France to the Swiss border. What followed was a "race to the sea", where each side tried to bypass the other from the west. However, this strategy eventually led to the construction of a network of trenches to consolidate and protect the positions acquired. This scenario marked the beginning of trench warfare, which lasted for several years, symbolising the stagnation and deadlock of the conflict on the Western Front.
The assassination of Archduke Franz Ferdinand in Sarajevo, Bosnia and Herzegovina, on 28 June 1914, is considered the triggering event of the First World War. The murder created a major international crisis, which led to an escalation of tensions between European countries and a series of alliances, which eventually led to war. Gavrilo Princip, who murdered the Archduke, was a Serbian nationalist with links to the Serbian terrorist group the Black Hand.


After the Sarajevo bombing, Austria-Hungary presented an ultimatum to Serbia on 23 July 1914, demanding an investigation into Serbia's involvement in the bombing and the suppression of anti-Austrian activities on its territory. Serbia agreed to most, but not all, of the demands, and Austria-Hungary finally declared war on Serbia on 28 July 1914, leading to an escalation of tensions and alliances that culminated in world war.
In December 1914, the war's Western Front stretched from the English Channel to the German border, a 700-kilometre stretch through northern France and Belgium. Both belligerents entrenched themselves in impenetrable trench positions, turning the conflict into a series of static and deadly face-offs. Nevertheless, efforts were still being made to break the deadlock. Although massive offensives often resulted in huge losses without much territorial gain, the hope of a decisive breakthrough never completely faded. This fierce fighting on the Western Front continued until the end of the war in 1918.


After Austria-Hungary declared war on Serbia on 28 July 1914, alliances were formed and one country after another declared war. Germany declared war on Russia on 1 August 1914 and on France the following day, leading to the United Kingdom entering the war in support of France. Subsequently, many other countries joined the conflict, including Italy, Japan, the United States, the Ottoman Empire, etc. By mid-August 1914, most of the major European powers were involved in the conflict.
From December 1914 until the end of the conflict in November 1918, the belligerents were mired in trench warfare. This type of warfare was characterised by networks of deep, fortified trenches protected by barbed wire and heavy weapons. These trenches, often only a few dozen metres apart, became the scene of incessant fighting. Much of the military activity consisted of assaults on enemy trenches, intensive artillery bombardment and carefully planned large-scale offensives, all with the aim of breaking through the enemy lines. These attempts often resulted in minimal gains of territory at the cost of considerable loss of life. This war of position, emblematic of the First World War, entailed colossal human and material costs on both sides. The trenches, symbols of this stalemate and of the futility of war, have left their mark on our memories and have gone down in history as testimony to the carnage of that era.


After declaring war on France on 3 August 1914, Germany launched a lightning offensive through Belgium, hoping to defeat France quickly before reinforcements could arrive. This rapid advance was halted by the resistance of French and British forces and the Battle of the Marne, which took place from 6 to 12 September 1914. This was one of the most important battles of the First World War, and it eventually drove back the German forces and saved Paris from capture. However, the war was not to be as short as expected, and the struggle would continue for another four years, resulting in massive losses of life and property.
The trench warfare that raged on the Western Front between 1915 and 1918 during the First World War was marked by unprecedented brutality. Soldiers on both sides of the conflict were forced to live in appalling conditions, confined to cramped, unhealthy trenches, exposed to bad weather and disease, and under constant artillery fire. They were also subject to toxic gas attacks, air raids, machine-gun fire and bayonet assaults. The slaughter was immense: millions of lives, both military and civilian, were lost, and countless others were wounded, traumatised or displaced by the fighting. The war also left an indelible mark on the psyche of the survivors, with many soldiers suffering from war trauma, psychiatric disorders and eating disorders. The scale of the devastation, both physical and psychological, had a profound effect on the societies affected, leaving a lasting legacy of pain and loss. The horror and inhumanity of trench warfare became symbols of the futility and absurdity of war in general.


After the Battle of the Marne in September 1914, French and British forces sought to continue the offensive into Germany. However, the German armies were able to withdraw and entrench themselves in well-established defensive positions, which stretched from the North Sea to the Swiss border, through Belgium and France. Both sides therefore began a 'race to the sea', attempting to outflank the other from the west, which eventually led to the construction of trenches to protect the occupied positions. This marked the beginning of trench warfare, which would last for several years.
The Battle of Verdun and the Somme Offensive, which took place in 1916, were among the most devastating battles of the First World War. These battles are regarded as emblematic examples of the brutality and massive loss of life characteristic of trench warfare. The Battle of Verdun began on 21 February 1916 with a German offensive. The German forces hoped to exhaust the French army by forcing it to defend the fortified town of Verdun. The battle lasted until 18 December 1916, making it one of the longest in history. It was marked by fierce fighting, massive bombardments, the use of poison gas and enormous loss of life. It is estimated that there were around 800,000 casualties, many of whom died in terrible conditions. The Somme Offensive began on 1 July 1916, with the aim of relieving pressure on the French forces at Verdun and weakening the German army. British and French forces launched an offensive along a 40km front in northern France. The first day of the offensive was the deadliest in the history of the British Army, with around 57,000 casualties. The offensive, which lasted until November, claimed more than a million casualties on both sides. These battles have left a deep imprint on our collective memory because of their violence and the scale of the loss of life. They contributed to making 1916 one of the deadliest years of the First World War.


In December 1914, the war front ran from the English Channel to the German border, stretching some 700 kilometres across northern France and Belgium. Both sides were deeply entrenched in defensive trench positions, and military operations had become static and deadly confrontations between the two sides. However, there were still attempts to break the stalemate, and fighting would continue on this front until the end of the war in 1918.
The Chemin des Dames Offensive, also known as the Second Battle of the Aisne, took place in April 1917. It was orchestrated by French General Robert Nivelle, who had promised a decisive victory over the Germans in 48 hours thanks to an innovative artillery strategy and rapid movement. However, the preparations for the offensive were well known and the German forces were well prepared to resist it. The offensive began on 16 April 1917 and was immediately met with strong resistance. The French soldiers came up against reinforced and well-prepared German defences, incessant machine-gun fire and unfavourable weather conditions. In addition, the French artillery was unable to effectively eliminate the German defences before the attack. Instead of the promised quick victory, the offensive turned into a costly stalemate that lasted until 9 May 1917, with few territorial gains to show for it and catastrophic casualties. French losses were estimated at around 187,000 men, and German losses at around 168,000. This devastating defeat had a significant impact on the morale of French troops, leading to large-scale mutinies in the French army. The political consequences of this failure were just as significant. Nivelle was quickly removed as commander-in-chief and replaced by General Philippe Pétain, who had to work hard to restore morale in the French army. This event marked a turning point in the way the war was fought by the French, with a shift to a more defensive and cautious strategy.


From December 1914 until the end of the war in November 1918, armies on both sides were drawn into a war of position, which consisted of a series of deep, fortified trenches protected by barbed wire and heavy guns. The trenches were often located only a few dozen metres from the enemy's, and both sides fought hard to try to gain the upper hand. Military operations consisted mainly of small-scale attacks on enemy trenches, massive artillery bombardments and long-planned offensives to try to break through enemy lines. This war of position was one of the most distinctive features of the First World War, and it resulted in massive losses of life and property on both sides.
The entry of the United States into the war in April 1917 provided valuable support to the Allies. When the United States entered the war, it was an economically robust nation and had a large potential population of soldiers. Although their regular army was small and inexperienced, they were able to mobilise quickly and send large numbers of troops to Europe. The American contribution was essential in both material and human terms. Economically, the United States provided significant financial support to the Allies, enabling them to maintain their war effort. The United States also provided large quantities of supplies, equipment and munitions, which helped the Allies maintain their numerical superiority over the Axis forces. In human terms, the arrival of the American Expeditionary Forces (AEF), led by General John J. Pershing, strengthened the Allied forces on the Western Front. American troops took part in several major offensives in 1918, helping to turn the tide of the war. However, although America's entry into the war had a significant impact, it came relatively late in the conflict and was not the decisive factor in the Allied victory. Previous battles, fought mainly by French, British and Russian forces, had considerably weakened the central forces even before the Americans arrived on the front.


Positional warfare, or trench warfare, which took place on the Western Front of the First World War between 1915 and 1918, was a veritable slaughter. Soldiers on both sides were confined to narrow, unhealthy trenches, exposed to the elements and disease, and subjected to relentless artillery fire, poison gas, air raids, machine gun attacks and bayonet assaults. The loss of life was enormous, with millions of dead and wounded, both soldiers and civilians affected by the fighting and displacement. This trench warfare also had significant psychological and social repercussions, with many soldiers suffering from trauma, psychiatric disorders and eating disorders.
The final year of the First World War, 1918, saw a major shift in the balance of power. After years of trench warfare and attrition, the Allied forces were able to launch several successful offensives that finally forced Germany to capitulate. After signing the Treaty of Brest-Litovsk with Russia in March 1918, Germany launched a series of massive offensives on the Western Front, known as the Spring Offensives. However, although these offensives initially met with some success, they failed to break the Allied line decisively and cost Germany many precious lives. The Allied forces launched a series of counter-offensives, the most famous being the Second Battle of the Marne in July 1918. This battle marked the beginning of the end for German forces on the Western Front. Subsequently, the Allies launched the Hundred Days Offensive, a series of attacks that gradually pushed the German forces back from their positions. The Meuse-Argonne offensive, in which American forces played a significant part, was a key part of this campaign. Meanwhile, Germany was plagued by internal unrest, including strikes, mutinies and civil unrest, exacerbated by food shortages caused by the British naval blockade. Against this backdrop, Germany asked for an armistice, which was signed on 11 November 1918, putting an end to the fighting on the Western Front. This armistice marked the end of the First World War, although the final terms of the peace were not fixed until the Treaty of Versailles the following year.


1916 was a particularly deadly year in the First World War, with two major battles taking place on the Western Front: the Battle of Verdun and the Somme Offensive. The Battle of Verdun began in February 1916 when German forces launched a massive offensive on the town of Verdun in eastern France. It was one of the longest and bloodiest battles of the war, lasting almost 10 months. It was marked by fierce fighting, massive bombardment, the use of poison gas, and considerable loss of life on both sides. The Somme Offensive began in July 1916, when British and French forces launched a coordinated offensive along a 40km front in northern France. This battle was also very deadly, with heavy casualties on both sides, particularly from German machine gun fire that mowed down wave after wave of Allied soldiers.  Both battles resulted in huge casualties, with several hundred thousand dead and wounded on each side.
11 November 1918 marked the official end of hostilities in the First World War. This day became known as Armistice Day and is commemorated every year in many countries. The armistice was signed in a train carriage in the forest of Compiègne in France. The terms of the armistice required, among other things, that the Germans evacuate the occupied territories, surrender a significant amount of artillery and other military equipment, and allow certain areas of Germany to be occupied by the Allies. After the armistice was signed, peace negotiations began in Paris. These negotiations culminated in the signing of the Treaty of Versailles in June 1919. This treaty placed the responsibility for the war on Germany and its allies and demanded from them considerable reparations, territorial concessions and disarmament. The harsh terms of the treaty were a source of controversy and resentment in Germany, contributing to the tensions that eventually led to the Second World War.


The Chemin des Dames Offensive took place in April 1917 on the Western Front of the First World War. The offensive was launched by French forces under the command of General Nivelle and aimed to break the German lines in the Aisne region of France. However, the offensive turned out to be an abject failure for the French forces, who suffered heavy casualties without succeeding in breaking through the German lines. The French soldiers were ill-prepared and ill-equipped, and the Germans had reinforced their defences in anticipation of the attack. The Chemin des Dames Offensive had disastrous consequences for France, with almost 200,000 soldiers killed, wounded or captured, and a serious moral crisis in the army and the civilian population. The defeat also led to mutinies in the French army and the resignation of Nivelle.
Russia, as a member of the Triple Entente with France and the UK, played an important role in the war. However, Russia faced many difficulties during the war. The defeat at the Battle of Tannenberg was a major setback for the Russian army and marked a turning point in the war on the Eastern Front. Over the next few years, Russia continued to struggle against the central forces, but was weakened by internal problems, including growing dissatisfaction with the war, economic mismanagement and political instability. These problems culminated in 1917 with the February and October Revolutions. The February Revolution overthrew Tsar Nicholas II and established a provisional government, while the October Revolution brought the Bolsheviks to power. After taking control, the Bolsheviks quickly began peace negotiations with Germany, which led to the signing of the Treaty of Brest-Litovsk in March 1918. This treaty officially ended Russia's participation in the First World War. However, Russia's exit from the war had major consequences for the Allies, as it allowed Germany to concentrate all its forces on the Western Front. However, this situation was eventually offset by the entry of the United States into the war in April 1917, which helped to redress the balance of power.


The entry of the United States into the war in April 1917 had a significant impact on the balance of power between the warring powers. The US provided significant economic and military support to the Allies, which helped to strengthen their fighting capacity. The US also provided fresh, well-equipped troops to fight on the front line, which helped relieve the pressure on the exhausted European troops. The arrival of the US army also created a new dynamic on the front, increasing the number of troops and bringing innovative technologies and tactics. However, it should be noted that American troops were slow to arrive at the front and to become operational, and their contribution to the final victory of the war was relatively limited compared to that of the other Allies. Nevertheless, the entry of the United States into the war helped to change the course of the war and strengthen the position of the Allies.
The Balkans were a theatre of particularly intense confrontation during the First World War. Romania, with a majority of its population of Latin language and culture, joined the Triple Entente, composed mainly of France, the United Kingdom and Russia, in the hope of recovering Romanian-populated territories that were then under the control of the Austro-Hungarian Empire. However, the Romanian offensive was halted by the forces of the Central Empires (Germany, Austria-Hungary and their allies) and Romania was occupied until the end of 1918, when the collapse of the Central Empires allowed Romania to recover and even expand its territory. Serbia, meanwhile, was a key player in the outbreak of war with the assassination of Archduke Franz Ferdinand of Austria in Sarajevo in June 1914. Serbia resisted the Austrian offensives in 1914, but was invaded and occupied in 1915 by the forces of the Central Empires. However, with the help of French and British forces who had landed at Salonika in Greece, Serbia managed to regain control of its territory during the Allied counter-offensive in 1918, contributing to the collapse of Austria-Hungary and the eventual Allied victory. It is also important to note the role played by other Balkan nations during the war. Bulgaria, for example, aligned itself with the Central Empires, hoping to recover the territories lost in previous Balkan wars, but was ultimately defeated and suffered significant territorial losses in the Treaty of Neuilly-sur-Seine in 1919. Similarly, Greece, after a period of neutrality and internal tensions, joined the Allies in 1917 and played an important role in the Balkan operations.


In 1918, the situation on the front line shifted in favour of the Triple Entente, consisting of France, the UK and Russia (which withdrew in 1917). The Allied forces successfully resisted the German offensives of March 1918 and regained the initiative with decisive counter-offensives in the summer and autumn of the same year. The Allied Marne offensive in July 1918 broke the German lines and forced their retreat, while the Meuse-Argonne offensive in September-November 1918 helped to isolate and weaken the German forces. At the same time, the domestic situation in Germany was deteriorating, with strikes, mutinies and civil unrest increasing. The Allied naval blockade had also begun to starve the German population. Faced with this situation, Germany asked for an armistice in November 1918, ending the war.
Russia has historically had ambitions to expand southwards, in particular to secure year-round access to ice-free water. The Bosphorus and Dardanelles Straits, which link the Black Sea to the Mediterranean, were of major strategic importance to Russia as they were the only sea passage for Russian ships from the Black Sea to the rest of the world. In addition, Russia presented itself as the protector of the Slavs and Orthodox Christians in the Balkans, which led to tensions with the Ottoman Empire, which controlled a large part of the region. This played a part in Russia's involvement in the First World War alongside Serbia and other Slavic countries in the Balkans. The war against the Ottoman Empire proved difficult for Russia. The war effort was complicated by internal problems, including social and political tensions that eventually led to the Russian Revolution and the collapse of the Tsarist regime. After the revolution, the new Communist government sought to end the war. Under the Treaty of Brest-Litovsk in 1918, Russia renounced its claims to the straits in exchange for an end to hostilities with the Central Powers, which included the Ottoman Empire.[[fichier:fronts1418.jpg|center|thumb|350px|Fronts of the First World War.]]


On 11 November 1918, Germany signed the armistice ending the fighting in the First World War. Hostilities officially ceased at 11 a.m., ending more than four years of war that had left millions dead and wounded. Negotiations for a peace treaty lasted several more months and were finally concluded with the Treaty of Versailles in June 1919.
== The Globalisation of Conflict: International Actors ==
The First World War was a world war in the sense that it involved nations from all over the world. The European colonial empires played an important role in the conflict, providing troops, resources and sometimes additional theatres of war. The First World War was a global conflict, involving nations from all over the world. The European colonial empires played an important role in the conflict, mobilising their colonies to provide troops and resources, and sometimes even serving as additional theatres of war. The British Empire mobilised many countries for the conflict. Nations such as India, Canada, Australia, New Zealand and South Africa sent troops to fight alongside the British. In particular, India provided almost 1.5 million soldiers who served in Europe, Africa and the Middle East. Similarly, France mobilised troops from its colonies, with soldiers coming from regions such as Algeria, Morocco, Tunisia, sub-Saharan Africa and Indochina. Germany used its colonies mainly for their resources. However, in some cases, fighting did take place in these regions. In East Africa, for example, German General Paul von Lettow-Vorbeck led an effective guerrilla campaign against British forces. The contributions of these colonies had a significant impact, not only on the overall war effort, but also on relations between the colonial nations and their colonies. After the war, many of the promises of reform or independence made to the colonies were not fulfilled, leading to increased tensions and independence movements across the colonial world.


Russia was one of the key players in the First World War, entering the war in August 1914 alongside France and the United Kingdom. However, it suffered heavy defeats at the hands of Austro-Hungarian and German forces on the Eastern Front, notably at Tannenberg in August 1914. In 1917, the situation in Russia deteriorated due to the economic and social crisis and the unpopularity of the war. This led to the October Revolution, which saw the Bolsheviks take power and set up a communist government. In March 1918, the new Russian government signed the Treaty of Brest-Litovsk with Germany, which ended Russia's participation in the war. This allowed Germany to transfer its troops to the Western Front, which made the situation worse for the Allies
The First World War had a major impact on colonial territories, bringing about profound political, economic and social changes. The fighting was often carried out by colonial troops recruited by the European powers, and many territories were affected by the war. In Africa, there were clashes between French, British, Belgian and German colonial forces for control of the German territories in East Africa. This led to population displacements, economic disruption and increased exploitation of natural resources. In Asia, tensions also increased, particularly in the German colonies in China and the Pacific, which were taken over by the Japanese. Nationalist movements in India were galvanised by the war, leading to increased demands for autonomy and independence. In the Pacific, German New Guinea was taken by Australia, while New Zealand took control of German Samoa. These conflicts paved the way for new colonial arrangements after the war. The First World War therefore not only affected European nations, but also had a lasting impact on their colonies and shaped the political and social development of these regions.


The fighting in the Balkans was very intense during the First World War. Romania, which had signed a secret agreement with the Allies in 1916, joined the war on the side of the Triple Entente in August of that year. However, the Romanian offensive soon failed in the face of the German and Austro-Hungarian army, and Romania suffered heavy territorial losses. Serbia was attacked by Austria-Hungary from the beginning of the war and suffered heavy defeats. However, with the help of France and Britain, Serbia was able to launch a counter-offensive in 1918, which contributed to the defeat of Austria-Hungary and the end of the war.
The First World War profoundly disrupted the global economy. The entire global trading system was disrupted, trade between countries was reduced and the supply of essential resources was disrupted. Countries at war had to reorient their economies to support the war effort. This meant a massive increase in military production, but also a reduction in the production of consumer goods, leading to shortages and inflation. Neutral countries were also affected, as their traditional trade routes were disrupted and they had to look for new trading partners. The war also exacerbated economic and social inequalities, both between and within countries. The rich became richer as a result of the war, while the poor became poorer, leading to social and political tensions. Ultimately, the First World War undermined the existing world economic order and paved the way for subsequent economic and political crises, notably the Great Depression of the 1930s. The war dramatically demonstrated the extent to which the world's economies were interconnected and dependent on each other, and underlined the need for international cooperation and coordination to maintain global economic stability.[[fichier:Le-Monde-et-le-1er-conflit-mondial-1914-18GF.gif|center|thumb|400px|The world and the first world conflict - [http://www.atlas-historique.net/1914-1945/cartes/Monde1914-18.html atlas-historique.net]]]


The Russian Empire's ambition was to expand southwards towards the Mediterranean and in particular to take control of the Bosphorus and Dardanelles straits, which the Ottoman Empire then controlled. This ambition led Russia to support nationalist movements in the Balkans and to engage in war against the Ottoman Empire in 1914, as part of the First World War.  
The First World War was a total conflict, marked by the mobilisation of all national resources - human, economic and technological - to wage war. It was not only the armies that were involved in the conflict: civilians were also greatly affected by the war, through the bombardments, the deprivations caused by the blockade and the mass conscription of the male population.
[[file:fronts1418.jpg|center|thumb|350px|Fronts of the First World War]]


== The Globalisation of Conflict: International Actors ==
In military terms, the war was marked by technological innovation, with the introduction of new weapons such as tanks, aircraft, submarines and poison gas. However, military strategy has often been marked by an outdated vision of war, with massive offensives costing human lives, and little room for manoeuvre or exploitation of new technologies.
The First World War quickly took on a global dimension, involving European empires and their colonies and allies around the world. For example, British, French and German colonies were mobilised to join the war effort, sending soldiers and resources to Europe. The conflict also extended to colonial territories, with fighting in Africa, Asia and the Pacific. European empires fought for control of these territories, while nationalist and independence movements also gained momentum in these regions. In addition, the war also affected trade and economic relations around the world, disrupting trade and the flow of goods. The globalisation of the war thus amplified the consequences of the conflict and its repercussions were felt throughout the world.


[[file:Le-Monde-et-le-1er-conflit-mondial-1914-18GF.gif|center|thumb|400px|The-World-and-the-First-World-Conflict - [http://www.atlas-historique.net/1914-1945/cartes/Monde1914-18.html atlas-historique.net]]
Economic warfare was also a crucial factor in the conflict. The naval blockade imposed by the Royal Navy contributed in particular to weakening the German economy and causing food shortages in Germany. For their part, the Allies benefited from the economic support of the United States, which lent large amounts of money and provided resources and war material.


The First World War was a total conflict that involved military, economic and ideological aspects. At the military level, battles were fought on all fronts, including land, sea and air. Supplies of materials, food and resources were essential to the conduct of the war, hence the importance of economic warfare and the blockade strategy. In terms of ideological warfare, the countries involved sought to justify their participation using nationalist and imperialist arguments. Ideologies such as social Darwinism, patriotism and nationalism were used to justify the loss of life and the atrocities committed. The notion of 'civilisation' was also used to justify colonial wars and territorial conquests.
Finally, the war was accompanied by intense ideological propaganda. Each side sought to mobilise the nationalist sentiments of its population, dehumanise the enemy and justify the sacrifices necessary for victory. Concepts such as the "war for civilisation" or the "war for democracy" were widely used to give meaning to the war and to mobilise the population. However, these ideologies also helped to exacerbate national tensions and prepare the ground for subsequent conflicts.


=== The colonies of the European powers ===
=== The Colonies of the European Powers ===
The First World War also had important consequences in the colonies of European powers. The German colonies, especially in Africa, were the scene of fighting between the forces of the various colonial empires. British and French troops conquered the German colonies and seized their wealth, such as plantations, mines and natural resources. The colonies were also involved in the war effort, sending colonial troops to fight on the European fronts. Several hundred thousand African, Asian and American soldiers were mobilised, often in very difficult conditions. The colonies also provided resources and raw materials essential to the war effort, such as rubber, palm oil and cotton. This led to increased exploitation of the colonies and worsening working conditions for the local population.
The First World War also had major consequences in the colonies of the European powers. The German colonies, particularly in Africa, were the scene of fighting between the forces of the various colonial empires. British and French troops conquered the German colonies and seized their wealth, including plantations, mines and natural resources. The colonies were also called upon to contribute to the war effort, with colonial troops sent to fight on the European fronts. Several hundred thousand African, Asian and American soldiers were mobilised, often in very difficult conditions. The colonies also provided essential resources and raw materials for the war effort, such as rubber, palm oil and cotton. This led to increased exploitation of the colonies and worsening working conditions for the local populations.


=== The role of the United States ===
=== The role of the United States ===
American public opinion was divided over whether to go to war. On the one hand, those in favour of intervention were convinced that the United States should defend democratic values and help its European allies. On the other, isolationists advocated neutrality and feared that the war would damage the American economy. However, the United States' entry into the war in 1917 was ultimately motivated by several factors, including the attack on the liner Lusitania by a German submarine in 1915, which had resulted in the deaths of many Americans, and the discovery of a German plot to induce Mexico to declare war on the United States. Entry into the war was also seen as an opportunity for the United States to strengthen its position as a world power and to promote its democratic values abroad.
America's entry into the First World War sparked a national debate. On the one hand, the interventionists, who included politicians, intellectuals and journalists, argued that the United States had a moral responsibility to defend democratic values and support its allies in Europe, principally the United Kingdom and France. They were convinced that America could not remain aloof from the conflict that was redefining the global political landscape. Isolationists, on the other hand, advocated non-engagement. Many came from rural, remote areas of the Midwest and West, and were primarily concerned with domestic issues. They feared that involvement in the European conflict would damage the American economy and lead to higher taxes and possible conscription. They argued that the US should concentrate on solving its own problems and avoid getting involved in foreign conflicts. Ultimately, several factors led to the decision to enter the war in 1917, including Germany's indefinite submarine warfare which resulted in the deaths of American citizens, and the Zimmerman telegram which revealed a German proposal for Mexico to enter the war against the United States.


[[File:Zimmermann-telegramm-offen.jpg|thumb|right|alt=Zimmermann-telegramm-offen.jpg]]
Several events precipitated the United States' entry into the First World War in 1917, despite intense public debate. Firstly, the attack on the Lusitania, a British liner, by a German submarine in 1915 provoked strong indignation in the United States. The incident, which resulted in the deaths of 128 Americans, was widely condemned and helped to strengthen anti-German sentiment in the United States. The discovery of the Zimmermann telegram in 1917 also played a key role. This telegram, sent by the German foreign minister to his ambassador in Mexico, proposed a military alliance between Germany and Mexico, should the United States enter the war. This revelation aroused indignation among the American population and increased pressure for the United States to enter the war. Finally, the United States' entry into the war was seen by some as an opportunity to strengthen the country's international position and promote democratic values throughout the world. This decision marked the beginning of an era in which the United States would become increasingly involved in world affairs.[[File:Zimmermann-telegramm-offen.jpg|thumb|right|alt=Zimmermann-telegramm-offen.jpg]]


The torpedoing of the liner Lusitania in 1915 by the Germans was a key event that contributed to the United States' entry into the war in 1917. The Lusitania was a British passenger ship sailing from New York to Liverpool. On 7 May 1915, it was torpedoed by a German submarine off the coast of Ireland, killing nearly 1,200 passengers, including 128 Americans. This act of war shocked American public opinion and prompted President Woodrow Wilson to call Germany to account. Although the Germans justified the attack by claiming that the ship was carrying munitions, American public opinion saw the act as an unjustified attack on innocent civilians. This contributed to the United States' decision to enter the war on the side of the Triple Entente in 1917..
The sinking of the Lusitania had a profound impact on American public opinion and helped to change American attitudes to the war. The tragedy occurred in the context of total German submarine warfare, which sought to weaken the Allies by cutting off their supply lines. The Germans had warned that all ships sailing to Britain would be considered targets, but the sinking of the Lusitania, with its heavy loss of civilian life, was seen as an inexcusable act of aggression. The event was widely reported in the American media, which presented the sinking as an act of German barbarism. It caused a public outcry and fuelled anti-German sentiment in the United States. Although the US did not enter the war immediately after the sinking of the Lusitania, the incident was a turning point that helped pave the way for the US entry into the war two years later.


Indeed, in 1917, the Germans decided to wage all-out submarine warfare, i.e. to sink all merchant ships, including those of neutral countries, that approached the coast of Europe. This strategy was intended to weaken the Allied war effort by depriving them of food and weapons supplies from the United States and other neutral countries.  In response to the all-out submarine war, the United States broke its neutrality and entered the war on the side of the Entente in April 1917. American participation played an important role in the outcome of the war, helping to strengthen the Entente offensive on the Western Front. The US also provided crucial financial and material support to the Allies, which helped to hasten the end of the war.
The torpedoing of the Lusitania sparked outrage in the United States and put President Wilson in a difficult position. Although he had been re-elected in 1916 on the slogan "He kept us out of war", the situation was rapidly changing. After the sinking of the Lusitania, President Wilson sent several notes to Germany, demanding reparations and an end to unrestricted submarine warfare. However, US patience ran out after Germany resumed its unrestricted attacks on ships in 1917. The event helped sway public opinion in favour of intervention, and when Germany tried to incite Mexico to go to war against the US (as revealed in the Zimmermann Telegram), it was the last straw. In April 1917, President Wilson asked Congress to declare war on Germany, marking the United States' entry into the First World War.


The Zimmerman Telegram is an important event of the First World War that took place in January 1917. It was a message sent by the German Foreign Minister, Arthur Zimmerman, to the German Ambassador to Mexico, proposing an alliance between Mexico and Germany against the United States. In exchange for this alliance, Germany promised to support Mexico in its recapture of the territories in Texas, California and New Mexico, lost in the Mexican-American War in 1848. The Zimmerman telegram was intercepted and decoded by the British Secret Service, which forwarded it to the United States. This event provoked public outrage in the United States and contributed to the US decision to enter the war against Germany in April 1917.
Germany's resumption of unrestricted submarine warfare in 1917 marked a turning point in the United States' involvement in the First World War. This German policy angered the United States, which had maintained a position of neutrality since the start of the war in 1914. Unrestricted submarine warfare threatened vital Allied supplies, and by sinking neutral ships, Germany pushed the United States out of its neutrality. Germany hoped that this strategy would lead to victory before the United States could mobilise its army and navy for active combat. However, this strategy backfired. The United States made a significant contribution to the Allied war effort, both militarily and economically. Its human and material resources helped tip the balance in favour of the Allies on the Western Front, while its financial support helped maintain the Allies' fighting capacity. Ultimately, America's entry into the war played a key role in Germany's defeat and the end of the First World War in November 1918.


=== The involvement of Japan ===
The Zimmerman telegram is a striking example of how espionage and cryptography played an important role during the First World War. It also helped galvanise American public support for going to war against Germany. The telegram was intercepted by British intelligence thanks to their decryption efforts. The British realised the importance of this information and realised that it could be used to influence American public opinion in favour of going to war. However, they had to be careful about how they revealed the information to the Americans, as they did not want the Germans to know that they were able to decode their encrypted messages. Once the United States had been informed, President Woodrow Wilson took the decision to make the telegram public, despite the potential risks to British intelligence capabilities. The revelation of the telegram caused an uproar in the United States and added to the public and political pressure for the country to go to war. Ultimately, the Zimmerman telegram was one of the factors that led to the United States' entry into the First World War in April 1917.
Japan took advantage of Germany's entry into the war to expand its influence in Asia and the Pacific. It sent troops to China and Korea to consolidate its regional presence. Japan also sent warships to help the Allies patrol the Pacific Ocean and intercept German ships. Japan's participation in the war reinforced its status as a world power and paved the way for its territorial expansion in the following years.


Japan joined the war on the side of the Entente because of its alliance with Britain. However, its participation was mainly limited to military operations in the Pacific and Asia. In particular, Japanese troops occupied German colonies in the Pacific region, including the Marshall Islands and the Mariana Islands. Japan also provided warships and troops to assist Allied forces in naval operations in the Mediterranean Sea and the Atlantic Ocean. Japan's role in the First World War helped to reinforce its status as an emerging power on the world stage.
=== Japan's involvement ===
When the First World War broke out in 1914, Japan, which had formed an alliance with the United Kingdom in 1902, declared war on Germany. This gave Japan an excuse to extend its influence in Asia and the Pacific, particularly in areas that had been under German control before the war. Japan quickly occupied German island possessions in the Pacific, including the Carolines, Marshall Islands and Marianas. In mainland Asia, Japan seized control of the German concession at Qingdao, China. In addition, Japan took the opportunity to increase its influence over China. In January 1915, it presented China with the "Twenty-One Demands", which sought to establish quasi-colonial Japanese rule over China. Although China rejected some of the more extreme demands, it had to accept enough of them to significantly increase Japan's political and economic influence in China. After the war, despite some objections, Japan was able to retain most of its territorial gains at the Versailles peace conference in 1919, although this would be a source of tension with the United States and other nations in the years to come.
 
As well as expanding into Asia and the Pacific, Japan also played a significant role in supporting the Allied maritime efforts during the First World War. Japan, under its alliance with the United Kingdom, sent a fleet of destroyers to help protect and patrol the Pacific and Indian Oceans against German shipping. Japanese naval forces escorted Allied troop convoys, protected vital commercial shipping lanes, and actively sought out German surface raiders and submarines that threatened Allied shipping. These actions made a significant contribution to the Allied war effort in East and South-East Asian waters. Japan saw its participation in the First World War as an opportunity to improve its international position and its status as a great power. However, despite its contributions, Japan was frustrated by the treatment it received in the post-war peace settlement, fuelling nationalist and militarist sentiments that had significant repercussions in the decades that followed.
 
Japan's participation in the First World War played a significant role in establishing the country as a world power. By taking advantage of the opportunity to extend its influence in Asia and the Pacific, Japan succeeded in strengthening its power and influence on the international stage. The victory of Japan and the Allies in the First World War also enabled Japan to acquire several former German colonies in the Pacific, under the Treaty of Versailles. In addition, Japan was able to increase its economic and political influence in China, taking advantage of the chaos caused by the war and the revolutions underway in the country. However, despite these gains, Japan was dissatisfied with its treatment in the post-First World War world order, feeling that it had not received the recognition and respect it deserved as a world power. This feeling of dissatisfaction fuelled nationalist and militarist sentiments in Japan, contributing to the escalation of tensions in the following decades leading up to the Second World War.


=== The commitment of the Ottoman Empire ===
=== The commitment of the Ottoman Empire ===
The Ottoman Empire played an important role in the First World War. The Empire was one of the main allies of Germany and Austria-Hungary. The Ottomans fought on several fronts, including Mesopotamia (Iraq) against the British, Palestine against the British and French, and the Caucasus against the Russians.
The Ottoman Empire played a decisive role in the First World War. It sided with the Central Powers (Germany and Austria-Hungary), provoking conflicts on several fronts, including Mesopotamia, Palestine and the Caucasus. In Mesopotamia, the Ottomans faced a British offensive aimed at securing the region's oil fields and protecting important communication routes to India. Despite fierce resistance, the Ottoman forces were finally defeated by the British in the Battle of Baghdad in 1917. In Palestine, the Ottoman Empire fought against British and French forces. The fighting was particularly intense in this region because of its strategic value, with Jerusalem as its main target. The Allied forces, led by British General Edmund Allenby, finally achieved a significant victory with the capture of Jerusalem in December 1917. In the Caucasus, the Ottomans fought against the Russians in a series of conflicts known as the Caucasus Campaign. The fighting in this region was motivated by Russia's desire to control the strategic Bosphorus and Dardanelles straits, and the Ottoman Empire's desire to suppress Armenian nationalist movements. The Ottoman Empire's involvement in the First World War had significant consequences, ultimately leading to the dissolution of the Empire at the end of the war and the establishment of the Republic of Turkey.


The control of the Dardanelles Straits, linking the Black Sea to the Mediterranean Sea, was a major strategic issue for the Allies. In 1915, the Allies launched an amphibious offensive to take control of the straits. This campaign was a costly failure for the Allies and contributed to the consolidation of the power of the Young Turks, the ruling party in the Ottoman Empire, which pursued a policy of genocide against the Armenians and other Christian minorities in the Empire.
Control of the Dardanelles was of major strategic importance during the First World War. The Dardanelles is a narrow strait linking the Aegean Sea to the Sea of Marmara, and by extension, via the Bosphorus Strait, the Black Sea. Access to the Black Sea was essential for Russia, an ally of the Triple Entente (France, the United Kingdom and Russia), as it was one of its main export routes for grain and import route for munitions of war. In 1915, the Allies launched the Dardanelles campaign, or Gallipoli campaign, with the aim of taking control of the straits, opening up a supply route to Russia and forcing the Ottoman Empire out of the war. However, the offensive failed in the face of tenacious and well-organised Ottoman resistance. The battle was a disaster for the Allies, with heavy losses and no significant advances. At the same time, the policies of the Young Turks, the ruling party of the Ottoman Empire, led to the Armenian genocide of 1915-1917. More than a million Armenians were systematically killed or displaced in what is generally regarded as the first genocide of the 20th century. This policy also targeted other Christian minorities in the Ottoman Empire, notably the Assyrians and Pontic Greeks.


Eventually, the Ottoman Empire was defeated by British and Arab forces in 1918, and the Treaty of Sevres was signed in 1920, ending the war for the Ottoman Empire and resulting in the partition of the Empire.
At the end of the First World War, the Ottoman Empire, which had fought alongside the Central Powers (Germany, Austria-Hungary and Bulgaria), was defeated. The Empire was occupied by Allied forces, mainly Britain and France, with specific areas under Italian and Greek control. This marked the beginning of the end of the Ottoman Empire, which had existed for around 600 years. The defeat and occupation led to many political and social changes, the most significant of which was the emergence of modern Turkey under the leadership of Mustafa Kemal Atatürk. The Treaty of Sèvres, signed in 1920, provided for the partition of the Ottoman Empire and the establishment of several nation states. However, many of the treaty's provisions were hotly contested in Turkey and led to the Turkish War of Independence led by Mustafa Kemal Atatürk and his supporters. This war eventually led to the abolition of the Sultanate and the founding of the Republic of Turkey in 1923. The Turkish War of Independence also led to the abrogation of the Treaty of Sèvres and its replacement by the Treaty of Lausanne in 1923, which established Turkey's modern borders and confirmed its independence.


=== South America in the Conflict ===
=== South America in Conflict ===
Several South American countries participated in the First World War, mainly as suppliers of raw materials and logistical support. Brazil entered the war in 1917 on the side of the Triple Entente, mainly due to the destruction of Brazilian ships by German submarines. Argentina, Chile, Uruguay and Peru also provided supplies and war materials to the Triple Entente, while Paraguay and Ecuador remained neutral. These countries sought to position themselves on the international stage and to strengthen their political and economic influence.
Although South America was geographically distant from the main theatre of war in Europe, it was involved in the First World War in a variety of ways. Most South American countries remained neutral for most of the war, but supported the Allied war effort by providing raw materials, food and other resources.


The involvement of some South American countries, such as Brazil, in the First World War enabled them to participate in the Paris Peace Conference in 1919, which redrawn the political map of Europe and the world, and to become part of the League of Nations, the international organisation created to maintain peace after the war. This participation strengthened their role and influence in international affairs and contributed to their emancipation from the European powers and the United States.
Most South American countries, with the exception of Brazil, officially maintained their neutrality during the First World War. However, this did not prevent several of them from de facto supporting the Allies by providing raw materials, food and other resources. Brazil, in particular, declared war on Germany in 1917 after Brazilian merchant ships were torpedoed by German submarines. Brazil was the only South American country to send troops to Europe, although its military involvement was relatively limited. In addition to its military contribution, Brazil also played a key role in supplying vital resources, including rubber, coffee and meat, to the Allies. Argentina, Chile, Uruguay and Peru, although officially neutral, also supported the Allies by providing resources and allowing Allied ships to use their ports. On the other hand, countries such as Paraguay and Ecuador maintained strict neutrality throughout the war.
 
For the countries of South America, the First World War represented an opportunity to assert their independence and influence on the international stage. By supplying raw materials and other resources to the Allies, these countries were able to strengthen their economic and political ties with the great European powers. This enabled these countries to improve their economies, gain international recognition and establish themselves as important players in world affairs. Brazil, for example, became a founding member of the League of Nations (the predecessor of the UN) after the war, marking its rise as a regional power. As a result, participation in the war, albeit indirectly, gave these South American countries greater prestige and influence, and laid the foundations for their role in world affairs over the next century.
 
The participation of Brazil and certain other South American countries in the First World War enabled them to play an active role in the reconfiguration of the world order that followed. The Paris Peace Conference in 1919, which led to the signing of the Treaty of Versailles, was a crucial moment in this redefinition. Although the vast majority of decisions were taken by the major powers, the presence of these countries enabled them to take part in the discussions and present their perspectives. Their admission to the League of Nations was another important step. As members of this organisation, they had the opportunity to express their opinions on international issues and contribute to efforts to maintain world peace. In the end, although their influence was limited compared to that of the Great Powers, their involvement in the war and their participation in these organisations helped to strengthen their status and role on the international stage.


=== The Mobilisation of the Colonial Empires ===
=== The Mobilisation of the Colonial Empires ===
Empires also mobilised their economic and human potential to support the war effort. Colonies and territories under imperial rule provided an abundant workforce to support the war effort, supplying soldiers, workers and resources. France and Britain mobilised colonial troops, particularly in Africa, while British colonies such as Canada, Australia and New Zealand sent troops and provided significant economic support.
The war effort of the First World War required a total mobilisation of the resources of each participating empire, which included not only the mobilisation of their material resources, but also of their population, including those of the colonies. The colonial empires, particularly the British and the French, mobilised their colonies exhaustively. Hundreds of thousands of colonial soldiers were recruited to fight on the European fronts, notably from India, West Africa and the Maghreb for Britain and France respectively. These soldiers played a crucial role in the war effort, fighting and dying in the trenches alongside their fellow Europeans. In addition, the colonies also provided valuable labour behind the front, working in armaments factories, shipyards, mines and agricultural fields to support the war economy. This was particularly true of the British dominion colonies, such as Canada, Australia and New Zealand, which not only sent troops but also supported the war effort with their industrial and agricultural production. The colonial empires played a crucial role in the First World War, contributing significantly to the overall war effort and playing a key role in the outcome of the conflict.
The colonies were also called upon to produce raw materials and to participate in the industrial war effort. Imperial territories provided raw materials such as rubber, palm oil, minerals and precious metals, while colonial industries were mobilised to supply consumer and war goods such as clothing, footwear, weapons and munitions.
 
The colonies were used intensively for their production of raw materials, which were essential to the war effort. Minerals and precious metals, such as iron, copper and gold, were extracted in large quantities in the African, Asian and Oceanic colonies for use in the manufacture of arms and munitions. Similarly, rubber and palm oil, produced mainly in the colonies of South-East Asia and Africa, were indispensable to the war industry, used respectively in the production of tyres and lubricants. The colonies also contributed to the war effort by increasing their industrial production. Factories were created or converted for the production of military goods, while colonial workers were recruited in large numbers to work in these industries. This industrial mobilisation not only supported the war effort, but also brought about lasting social and economic changes in the colonies, promoting urbanisation and industrialisation. In addition, the colonies were also used as logistical and military bases, particularly those located on important shipping and communication routes. Colonial ports were used to supply warships, while air bases and communications facilities were built to support military operations. The contribution of the colonies to the war effort was multifaceted and essential to the outcome of the conflict.


However, the economic and human mobilisation of the Empires also had negative consequences for the colonial and indigenous populations, who often suffered harsh working conditions and severe restrictions on their freedom of movement and daily life. In addition, the participation of the colonies in the war gave rise to aspirations for independence and national liberation, which emerged with new strength after the end of the war.
Although the colonies played a crucial role in supporting the war effort of the colonial empires, the consequences for the colonial populations were often devastating. Working conditions in mines and factories were often harsh and dangerous, and many colonial workers were forced to work against their will, in what can be considered forced labour. In addition, the war effort led to shortages of food and other essential goods in many colonies, which had a significant impact on the daily lives of colonial populations. Restrictions on freedom of movement and severe control measures were also sources of resentment and dissatisfaction. In addition, the mobilisation of colonial troops and their participation in the war helped to raise aspirations for independence and national liberation. Colonial soldiers who had fought alongside European troops were often exposed to ideas of freedom and equality, and returned to their colonies with a heightened awareness of the injustice of colonial rule. These ideas were one of the catalysts for the decolonisation movements that emerged after the end of the war. In this way, although the colonial empires sought to exploit their colonies to support the war effort, they also sowed the seeds of their own decline.


The First World War was a conflict that involved many countries around the world, be it militarily, economically, politically or culturally. Colonial empires mobilised populations and resources from the colonies to support the war effort, while neutral countries suffered significant economic consequences due to the disruption of world trade and the shortage of raw materials. In addition, the conflict also had an impact on international politics and the formation of new states after the war, such as the creation of Czechoslovakia, Yugoslavia and Poland.
The First World War was a major turning point in world history, with repercussions far beyond the battlefields of Europe. The war led to the mobilisation of populations and resources on a global scale, including in the colonial empires. This had a profound impact on colonial societies, often at great human and economic cost. For neutral countries, the war disrupted world trade and created shortages of raw materials, with significant economic effects. These countries had to navigate a world at war, balancing the needs of their own economies with the pressure to take sides in the conflict. Politically, the war transformed the map of Europe and the world. New states emerged from the empires that collapsed at the end of the war, notably the Ottoman Empire, the Austro-Hungarian Empire and the Russian Empire. Countries such as Czechoslovakia, Yugoslavia and Poland emerged, redrawing the borders of Europe. Finally, the ideals of democracy and self-determination promoted during the war fuelled nationalist and anti-colonial aspirations across the world. The war also led to the creation of the League of Nations, an attempt (albeit ultimately unsuccessful) to establish an international system to prevent future conflict. The First World War was a truly global conflict, with repercussions that have reshaped the world we live in today.


= Final Reflections: Europe at the Centre of the World, from the End of the 19th Century to 1918 =
= Final Reflections: Europe at the Centre of the World, from the End of the 19th Century to 1918 =
The period from the end of the 19th century to the end of the First World War can be seen as a time when Europe was at the centre of the world, politically, economically and culturally. European empires dominated the world and their rivalry for control of territory and resources intensified.  
This period, often referred to as the "Age of Empires", was marked by European expansion and imperialism throughout the world. European empires, including the United Kingdom, France, Germany, Spain, Portugal, the Netherlands, Italy and Belgium, extended their influence to territories in Asia, Africa, the Americas and the Pacific. They sought to control these regions for their natural resources, markets and workforce, and often imposed their culture, language and political system on the local populations. In Europe itself, the political system was dominated by a complex web of alliances and rivalries between the great powers, which ultimately led to the outbreak of the First World War. Economically, Europe was the centre of world trade, with emerging industrial empires like Germany and established trading empires like the UK. Culturally, Europe also exerted a significant influence. European language, literature, philosophy, music and art had a global impact. Ideals such as liberalism, socialism, nationalism and Darwinism were widely disseminated and debated both in Europe and beyond. This period was also marked by resistance and protest. Anti-colonial movements began to emerge in many colonies, and social and political tensions in Europe led to major upheavals, including the Russian Revolution and the First World War. These events ultimately contributed to the end of the era of European domination and paved the way for the emergence of new world powers in the twentieth century.  


The First World War was the culmination of this rivalry and had dramatic consequences for Europe and the world. This global conflict led to unprecedented human and material losses, major political changes, the rise of nationalism, liberation movements in the colonies and the emergence of the United States as a global superpower.
The First World War profoundly altered the world's political, economic and social landscape. Politically, the war led to the fall of several empires, including the Russian, German, Ottoman and Austro-Hungarian empires. At the same time, it gave rise to many new nation states in Eastern Europe and the Middle East. It also marked the emergence of the United States as a global superpower, changing the international balance of power. Economically, the war caused enormous material losses and disrupted world trade. The financial costs of war led to high inflation and debt in many countries, which sowed the seeds of the Great Depression of the 1930s. Socially, the war caused the deaths of millions of people and left many more injured or traumatised. It also changed the role of women in society, many of whom had to take on traditionally male jobs while the men were at war. The war also stimulated colonial liberation and nationalist movements around the world. The Allies' promise of a "peace based on the right of peoples to self-determination" awakened aspirations for independence in many colonies. Finally, dissatisfaction with the terms of the Treaty of Versailles, which ended the war, contributed to the emergence of radical and totalitarian movements, notably Fascism in Italy and Nazism in Germany, which eventually led to the Second World War.


The First World War also led to the birth of the League of Nations, the forerunner of the United Nations, in the hope of preventing future global conflicts. However, the consequences of the war also contributed to the rise of Nazism in Germany and the Second World War.
At the end of the First World War, the League of Nations was created with the aim of maintaining world peace and preventing future conflicts. This was one of the main points of US President Woodrow Wilson's "Fourteen Points" programme, which was presented as a plan for peace after the war. The League of Nations was the first international body of its kind, and it provided a forum for the peaceful resolution of conflicts. However, it faced many challenges and limitations, not least the fact that the United States never joined the organisation despite Wilson's involvement in its creation. Despite its ambitions, the League of Nations was unable to prevent aggression by fascist powers in the 1930s, and was eventually dissolved during the Second World War. The rise of Nazism in Germany was directly linked to the consequences of the First World War. The terms of peace laid down in the Treaty of Versailles were harsh on Germany, which was held responsible for starting the war and forced to pay crushing reparations. These conditions, combined with the economic crisis that followed, helped to create a sense of resentment and despair in Germany, creating fertile ground for the extremism and nationalism that led to the rise of the Nazi party.


Ultimately, the period from the end of the 19th century to the end of the First World War was marked by unchallenged European dominance and rivalries that led to a world war. This had profound consequences for Europe and the world, which continued long after the conflict ended.
The First World War, in particular, marked the end of the golden age of European imperialism and reshaped the political and economic map of the world. Many empires, such as the Russian Empire, the German Empire, the Austro-Hungarian Empire and the Ottoman Empire, collapsed as a result of the war. At the same time, new countries were created and new forces, such as the United States and Japan, began to assert their power on the world stage. The war also left a heavy legacy of trauma, loss and disillusionment, which has affected generations of people around the world. In addition, the harsh conditions imposed on Germany by the Treaty of Versailles contributed to the rise of extremism and the outbreak of the Second World War a few decades later. Ultimately, the impact of this period on world history was monumental, and its consequences are still felt today.


The First World War profoundly changed the world order and marked the beginning of the end of European hegemony over the world. The enormous loss of life and property led to a questioning of the values and certainties that governed European society. In addition, the war accelerated the emergence of new powers such as the United States, Japan and the Soviet Union, which would challenge the world balance.
The First World War marked a major turning point in world history, triggering a series of transformations that reorganised the political map of the world. The European empires, which had dominated the world for centuries, were profoundly weakened by the war. The German, Austro-Hungarian, Russian and Ottoman empires collapsed, and new states were created in their former territories. The British and French empires survived the war, but were weakened and faced many challenges, including unrest in their colonies and economic crises at home. At the same time, the war marked the emergence of new powers on the world stage. The United States, which had remained largely isolated from European affairs before the war, became an economic and military superpower. The American economy was boosted by the demand for industrial and agricultural products during the war, while victory reinforced the prestige and international influence of the United States. Similarly, Russia, which underwent a revolution in 1917 and became the Soviet Union, began to play a major role in world politics. Despite the Soviet Union's initial isolation, the country went on to become a global superpower over the course of the twentieth century. The war also accelerated Japan's rise as a major power in Asia and the Pacific. By taking advantage of the war to extend its influence, Japan laid the foundations for its imperialist expansion in the following decades.


The war also had important economic consequences, with the rise of the United States as the world's leading economic power and the decline of Europe. Finally, the war paved the way for new conflicts, in particular the Second World War, which would further upset the world order.
The economic consequences of the First World War were major and led to a significant realignment of world economic power. Before the war, European countries, in particular the United Kingdom and Germany, were world leaders in industry and trade. However, the immense damage caused by the war, as well as the burden of war debts, considerably weakened the European economies. On the other hand, the United States, which was relatively isolated from direct conflict until 1917, was able to prosper by supplying goods and loans to the belligerent nations. After the war, with its powerful industry and flourishing economy, the United States became the world's leading economic power. At the same time, the First World War planted the seeds for future conflicts, in particular the Second World War. The Treaty of Versailles, which ended the First World War, imposed heavy reparations on Germany and controversially redrawn the map of Europe. These conditions sowed discontent and resentment in Germany and elsewhere, creating fertile ground for extremist movements such as Nazism and ultimately leading to the Second World War. As a result, the First World War not only redefined the global political order, but also brought about a major economic realignment and laid the foundations for future conflicts.


The First World War marked a major turning point in world history, which saw Europe gradually lose its position as world leader and which would permanently upset the geopolitical balance.
The First World War marked a key transition in world history. Europe, which had long dominated the world stage politically, economically and culturally, saw its influence reduced as a result of the war. Enormous human and material losses, the economic burden of reconstruction and war debts, and internal political tensions weakened the European powers. Meanwhile, new powers began to emerge on the world stage. The United States, in particular, saw its influence grow after the First World War. Because of its late intervention in the war, it suffered far fewer losses than the European powers, and its economy became one of the strongest in the world. In addition, the Soviet Union, born of the Russian Revolution of 1917, emerged as a new superpower with an ideology that challenged the existing world order. The end of the war also saw the dismantling of the great empires in Europe, such as the Russian Empire, the Austro-Hungarian Empire and the Ottoman Empire, and the creation of new national states in Eastern Europe and the Middle East. These changes redefined the global balance of power and led to new tensions and conflicts, laying the foundations for the Second World War. The First World War was therefore a major turning point in world history, overturning the existing world order and shaping the world as we know it today.


= Annexes =
= Annexes =
Ligne 399 : Ligne 577 :
*Quand l'Europe dominait le monde et ses richesses. Abo.monde-diplomatique.fr,. (2015). Retrieved 19 September 2015, from http://abo.monde-diplomatique.fr/media/pdf/atlas_histoire/10-11.pdf
*Quand l'Europe dominait le monde et ses richesses. Abo.monde-diplomatique.fr,. (2015). Retrieved 19 September 2015, from http://abo.monde-diplomatique.fr/media/pdf/atlas_histoire/10-11.pdf


= Références =
= References =
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Version actuelle datée du 20 juillet 2023 à 14:08

Based on a lesson by Ludovic Tournès[1][2][3]

Spanning the period from the end of the 19th century to the end of the First World War in 1918, this historic era witnessed the rise of Europe as a global pivot. It was a period marked by major transformations - economic, political, social and cultural - that had a profound impact on global history. At the end of the 19th century, Europe was controlled by major colonial powers, including mainly the United Kingdom, France, Germany and Italy. These nations extended their reach across the globe, and their rivalries for control of colonial territories and world markets led to an arms race and rising tensions on the European continent.

It is fair to say that Europe was a key player on the international stage right up to the end of the First World War in 1918. This pre-eminence was due to a combination of factors, including Europe's economic and colonial dominance on a global scale, the antagonism between the great European powers, and their direct influence on world political events.

However, the First World War led to a significant decline in European influence in international affairs. The conflict devastated the continent's economies and infrastructure, leading to a weakening of its economic and political power. The war also saw the emergence of new powers such as the United States and the Soviet Union. In addition, the repercussions of the First World War catalysed the rise of nationalist movements and authoritarian regimes in Europe, jeopardising the region's political stability. The advent of Nazism in Germany in the 1930s led to the Second World War, marking a new phase of decline for Europe. So, although Europe reigned supreme in international relations until the end of the First World War, this conflict caused a redistribution of the global balance and signalled the beginning of a decline in Europe's influence on the international stage.

The European System and Order[modifier | modifier le wikicode]

The European system established at the Congress of Vienna in 1815 was largely dominated by five major powers - France, the United Kingdom, Russia, Austria and Prussia. This system, sometimes referred to as the Concert of Europe, was designed to maintain the balance of power in Europe after the upheavals of the Napoleonic Wars. The Congress created a new map of Europe, redefining the borders of nations and seeking to balance the interests of the great powers to prevent further large-scale conflict. In theory, these powers undertook to respect the principles of national sovereignty and territorial integrity, and to resolve their differences through negotiation rather than war. However, during the 19th century, this system came under severe pressure. Historic nation-states such as France and Great Britain coexisted with newly emerging nation-states such as Italy (unified in 1861) and Germany (unified in 1871). At the same time, multinational empires such as the Austro-Hungarian Empire, the Russian Empire and the Ottoman Empire continued to exist, generating a series of complex tensions.

The balance of power established by the Congress of Vienna proved unstable. The great powers, seeking to extend their influence and territory, provoked growing diplomatic and military tensions. Prussia, for example, under the leadership of Otto von Bismarck, succeeded in unifying Germany and establishing it as a great power, thereby altering the balance of power in Europe. At the same time, the break-up of the Ottoman Empire created a power vacuum in the Balkans, leading to conflict and rivalry for control of this strategic region. Rivalries between the great powers eventually led to a series of military alliances to prevent aggression from others. However, far from preventing conflict, these alliances created a complex web of obligations that actually exacerbated tensions. The Triple Entente (made up of France, Russia and the United Kingdom) and the Triple Alliance (made up of Germany, Austria-Hungary and Italy) were ultimately the protagonists of the First World War in 1914, putting an end to the balance of power that had been established a century earlier.

From the end of the 19th century to the end of the First World War in 1918, Europe stood out as the beating heart of the world. This period was characterised by far-reaching social, economic and political transformations that profoundly reshaped the European landscape and the international system. The European system of this period was characterised by exacerbated rivalry between the European powers, struggling for control of colonies, markets and natural resources. Imperialism and competition for overseas territories fuelled tensions, leading to an arms race and strategic alliances. The great powers of the time, including the United Kingdom, France, Germany, Austria-Hungary and Russia, established alliances and agreements to safeguard their interests and strengthen their position on the international stage. Systems of alliances, such as the Triple Entente (United Kingdom, France, Russia) and the Triple Alliance (Germany, Austria-Hungary, Italy), shaped European geopolitics, creating a complex web of relationships that eventually led to the First World War. In this way, this period in European history illustrates how Europe became the pivot of the world stage, as a result of internal political dynamics, imperialist ambitions and the system of alliances that was put in place among the great powers.

The European order during this period was profoundly influenced by several major events, such as the Franco-German War of 1870-1871 and the Russo-Japanese War of 1904-1905. The inauguration of the German Empire in 1871, following the defeat of France and the annexation of Alsace-Lorraine by Germany, considerably heightened tensions between the European powers. These tensions led to the creation of protective alliances and unbridled competition to build up military capabilities. At the same time, the international system underwent major upheavals. The rise of the United States and Japan as new economic and military powers injected a new dynamic into international relations, challenging the traditional supremacy of the European powers and redrawing the balance of power on a global scale. The First World War, which began in 1914, marked the culmination of these tensions and rivalries. This major conflict not only put an end to the European order of the time, but also indelibly transformed the international system. It led to the weakening of the European powers, the rise of the United States and the Soviet Union, and laid the foundations for a new world order in the 20th century.

In the 19th century, Great Britain emerged as the leader of the industrial revolution, becoming the world's leading industrial power. Textile, steel and mining industries flourished, underpinning the national economy and providing employment for millions of workers. This industrial upheaval not only had an economic impact, it also profoundly changed the face of Britain, both domestically and internationally. On a national scale, the Industrial Revolution brought about a profound social transformation. The urban landscape was transformed by massive urbanisation, accompanied by explosive population growth and the emergence of new social classes. While this industrial revolution improved living conditions for some, it also accentuated social and economic inequalities, creating a growing gap between industrial workers and the ruling class. Internationally, the Industrial Revolution greatly enhanced Britain's status as a global superpower. Thanks to the economic power derived from its industrial dominance, Britain was able to extend its control over its vast colonial empire, consolidating its influence around the world. At the same time, Britain's economic power enabled it to develop a powerful navy, essential for the protection of its economic interests and colonies around the world. Britain used this naval power to secure its trade routes and extend its diplomatic and political influence beyond its borders.

The Industrial Revolution brought about a significant transformation in global power dynamics. Whereas powerful Asian empires such as India and China had previously dominated the global economy, the industrial rise of Europe altered this balance. As a result, the centre of global economic and political influence has shifted from Asia to Europe. However, European dominance was short-lived. Despite its pre-eminent position at the beginning of the 20th century, European hegemony began to crumble with the conclusion of the First World War in 1918. Several factors contributed to this decline. Firstly, the enormous toll of the war in terms of loss of life, material destruction and financial expenditure exhausted the great European powers. This weakened the economies of Europe, creating space for the rise of new powers, notably the United States. In addition, the war stimulated the emergence of nationalist and revolutionary movements both in Europe and in its colonies, challenging the European imperial order. For example, the Ottoman Empire was dismantled and India began to demand independence from Great Britain. Finally, the end of the war also led to the creation of new international institutions, such as the League of Nations, which sought to establish a new world order based on international cooperation rather than imperial domination. This new order ushered in a paradigm shift in global power, shifting influence from Europe to the United States and the Soviet Union, which became the new superpowers after the Second World War.

The dawn of the twentieth century was a crucial turning point in global history, marking the end of the European supremacy that had prevailed until then. Several factors contributed to this change of direction. The First World War inflicted considerable damage on the great European powers. The conflict drained their resources, caused catastrophic loss of life and spawned social and political movements on an unprecedented scale, shaking the status quo and diminishing Europe's weight on the world stage. This period also saw the emergence of new global forces that challenged European dominance. The United States, Russia and Japan strengthened their positions as economic and military powers, creating new centres of power and influence. Within Europe itself, a number of challenges have exacerbated the decline. The rise of nationalism and growing tensions between the great European powers have undermined the unity of the continent. In addition, the political and social upheavals that followed the First World War accelerated the process of decline. The rise of communism, independence movements in the colonies and the emergence of new political ideologies, such as fascism and Nazism, profoundly reshaped the global political landscape. In short, the end of European hegemony at the beginning of the twentieth century was the result of a complex interweaving of factors. They include the First World War, the rise of new economic and military powers, Europe's internal challenges and post-war political and social upheaval. These events ushered in a new era, during which the centre of global power gradually migrated from Europe to other parts of the world.

The Concept of the State System[modifier | modifier le wikicode]

The Treaty of Westphalia, signed in 1648, marked a decisive turning point in the way international relations are structured. It put an end to the Thirty Years' War, a series of religious and political conflicts that devastated central Europe. However, its impact went far beyond the mere cessation of hostilities. One of the most important achievements of the treaty was the introduction of the concept of the sovereign nation state, which became the fundamental building block of the global political order. This concept stipulated that each state had supreme authority within its borders and that no other state should interfere in its internal affairs. This principle was also reinforced by the concept of the equality of states, according to which all states, large or small, have the same rights and are equal under international law. Before Westphalia, Europe was dominated by the idea of the universal empire, which was an attempt to recreate the political order of the Roman Empire. According to this vision, there was a hierarchical order with a single leader, such as the Holy Roman Emperor or the Pope, who exercised supreme authority over the kings and princes of the whole of Europe. The Treaty of Westphalia overturned this vision by establishing the nation state as the principal political unit. This gave greater autonomy to individual states and laid the foundations for the modern interstate system. This system, which persists to this day, is based on the principle of state sovereignty, non-interference in the internal affairs of other states and the legal equality of all states.

The establishment of the principle of state sovereignty, enshrined in the Treaty of Westphalia, radically transformed the landscape of international relations. From then on, each state was master of its own internal affairs, creating a new dynamic between nations. By recognising that each state had the right to govern itself without outside interference, the Treaty of Westphalia established mutual respect for national independence and autonomy. This principle of non-interference gave rise to a new international order, characterised by a system of checks and balances. Under this system, states sought to maintain international balance by ensuring that no state or alliance of states became too powerful. This balance was maintained through constantly evolving alliances and limited wars, as nations sought to prevent the domination of any single actor.

The Treaty of Westphalia marked the end of an era for the Holy Roman Empire, a complex and disparate set of political entities that had dominated Central Europe for several centuries. The Thirty Years' War, with its chaos and destruction, had undermined the structure and authority of the Holy Roman Empire, creating a political vacuum. By signing the Treaty of Westphalia, European leaders recognised the independence of the many German states that had previously made up the Holy Roman Empire. These newly autonomous political entities were able to take control of their own destiny, marking the birth of the modern system of nation states in Europe. This new system was strongly rooted in the principle of state sovereignty, stipulating that each state had the right to conduct its internal and external policies without external interference. In addition, it adopted the principle of the balance of power, according to which no state or group of states should be powerful enough to dominate others. This paradigm shift not only redefined relations between the German states, but also had a profound impact on the political structure of Europe and the world as a whole. The principles of the Treaty of Westphalia helped shape the international system we know today, based on mutual recognition of sovereign states and respect for their political autonomy.

In the wake of the Treaty of Westphalia, European states structured their interactions around a series of bilateral and multilateral relationships. By forging alliances based on common interests and concluding diplomatic agreements, they sought to maintain a balance of power in order to avoid major confrontations. This created a complex web of obligations and responsibilities that shaped European politics for several centuries. However, this system of nation states began to show signs of strain at the dawn of the twentieth century. The arms race, imperial rivalry and nationalist tensions fuelled conflict and made it increasingly difficult to maintain a balance of power. The First World War marked a dramatic break in this dynamic. Not only did the conflict result in the loss of millions of lives and the destruction of large parts of Europe, it also called into question the very principles on which the nation-state system was based. The consequences of the war prompted world leaders to seek new ways of managing international relations, leading to the creation of the League of Nations and later the United Nations, marking the beginning of a new international order.

The Treaty of Westphalia enshrined a number of key principles that have shaped international relations to this day.

  • The first, the balance of power, aimed to prevent the domination of one nation over another by maintaining a balance of power between states. It encouraged the creation of alliances and coalitions to counter any attempt at hegemony by a single entity and to prevent major conflicts.
  • The second principle, that of non-interference, developed naturally from the concept of state sovereignty. Under this concept, each state is free to manage its internal affairs without outside interference, except in the event of a threat to collective security.
  • Finally, the principle of "Cujus regio, ejus religio" established that the religion of the sovereign determined that of the State, but also granted individuals the right to practise their religion freely. This clause was intended to put an end to the wars of religion that had severely fragmented Europe.

These principles not only reinforced political borders, but also restructured the hierarchy of powers in Europe. Nation states emerged as autonomous and sovereign political entities, with their own political, economic and military systems. At the same time, religion, while remaining an important element in the lives of many Europeans, gradually lost its political influence to political ideologies such as nationalism, liberalism and socialism.

These principles of the Treaty of Westphalia were the mainstay of European political organisation for almost two centuries. However, they have been severely tested throughout history. The Napoleonic Wars and then the First World War profoundly upset the balance of power in Europe. In addition, the emergence of nationalist movements and territorial disputes have often challenged the principle of non-interference, putting the sovereignty of states to a severe test. The Treaty of Westphalia marked a decisive turning point in the role of the Church in political affairs. Whereas in the Middle Ages, the Church enjoyed major political influence, the Treaty of Westphalia established the pre-eminence of the nation state, reducing the Church to a spiritual authority. This meant the separation of church and state, a fundamental principle that continues to shape European and global politics today.

The post-Westphalian international system, characterised by the independence and sovereignty of states, faced many challenges in the 19th century. Imperial expansion and rivalries between the great powers led to considerable tensions. The Napoleonic Wars certainly upset the balance of power in Europe, but they also paved the way for a reorganisation of the continent at the Congress of Vienna in 1815. The major European powers then established a new balance of power aimed at preserving stability and peace. This system, sometimes referred to as the "European Concert", ensured a degree of stability for much of the 19th century. However, the end of the 19th century and the beginning of the 20th saw the emergence of new tensions. The arms race, imperial ambitions, colonial tensions and growing nationalism led to a deterioration in international relations. These factors gradually undermined the balance of power and eventually led to the outbreak of the First World War in 1914. This conflict marked the end of the world order established at the Congress of Vienna and triggered a profound transformation in international relations.

Competition between states to increase their influence and power has been a central feature of international relations since the establishment of the nation-state system. However, this competition took on an unprecedented scale towards the end of the 19th century with the emergence of dynamic new powers, notably Germany and the United States. These nations challenged the pre-established balance, which was dominated mainly by the great European powers. Moreover, this race for power was not limited to Europe. It became global with colonisation and imperial expansion, where European nations, but also the United States and Japan, competed to establish their dominance over other regions of the world. This rivalry for global ascendancy came to a head with the outbreak of the First World War. The great European powers found themselves engaged in a total war, which not only devastated the belligerent nations but also radically altered the world political map. The war marked the end of the European order and precipitated a profound reorganisation of international relations.

Rivalry between the world powers and escalating tensions finally led to the outbreak of the First World War in 1914, putting an end to the fragile balance of power and stability that Europe had enjoyed until then. The war profoundly transformed the political map of the world, and in the wake of this devastating conflict, a new international order was established. The League of Nations was created with the aim of preserving international peace and security through cooperation and diplomacy. By creating a platform for dialogue between nations, the ambition was to resolve conflicts by peaceful rather than military means. However, despite these noble intentions, this new order was put to the test with the advent of Nazism in Germany and the continuing tensions between the Great Powers. These challenges, which the League of Nations proved unable to address effectively, led to another devastating world war. In the aftermath of the Second World War, the United Nations Organisation (UNO) was created in 1945, in the hope of filling the gaps left by the League of Nations. The UN sought to establish an international system that would promote not only peace and security, but also international cooperation in areas such as human rights and economic development.

Although the traditional European system was shaken by the devastation of the First World War, the concept of the nation state has not lost its relevance and remains at the heart of contemporary international relations. Nevertheless, the role and responsibilities of nation states have changed considerably over time. With the emergence of complex global challenges in the 20th century, such as globalisation, international terrorism and climate change, among others, states have been forced to revise and broaden their scope of intervention. These new challenges, which transcend national borders, have necessitated greater international cooperation in areas hitherto largely left to the discretion of individual states, such as public health, education and environmental protection. These developments have reaffirmed the central role of states in the management of international affairs, but in an increasingly globalised and interconnected context. Consequently, despite the demise of the classic European system, states continue to be key players in international relations. However, they are now doing so within a broader framework, which goes beyond political and military issues to encompass a multitude of areas affecting the well-being of the world's population.

Nation-States vs. Empire-States[modifier | modifier le wikicode]

Nation states and empire states have different characteristics.

A nation state is a type of political structure that has a largely homogenous population in terms of culture, history and language, and has defined and recognised borders. The government of this state has legal sovereignty over this territory and is recognised by other nation states. France, Germany and Japan are typical examples of nation states, in the sense that they have a distinct national identity based on shared culture, language and history. These unifying elements contribute to a strong and cohesive national identity.

An empire state is a political structure made up of various nations, ethnic or linguistic groups, often brought together by conquest. Unlike nation states, empire states can extend over vast territories and encompass a wide variety of cultures, histories and languages. Russia is a good example of a modern empire state, as it spans a large part of Eurasia and is home to a diversity of peoples and cultures. Historically, the Russian Empire, and later the Soviet Union, sought to integrate these diverse groups into a single state, sometimes by force. The Ottoman Empire is another example of a historical empire-state. From the 14th century until the end of the First World War, the Ottoman Empire controlled a vast territory that spanned three continents and included diverse peoples and cultures, including Turks, Arabs, Greeks, Armenians and many others. In these states, power was generally centralised in the hands of a ruling elite, which could be perceived as alien or even oppressive by certain groups within the empire. This can lead to tension and conflict, as we saw with the many nationalist movements that emerged in European empires in the 19th and 20th centuries.

Nation states and empire states have different histories in Europe.

The 19th century in Europe was marked by the nationalism movement, which promoted the idea that each nation, defined by a common language, culture, history and values, should have its own independent state. This movement played a key role in the emergence of modern nation states and the redefinition of political boundaries in Europe. In Germany, for example, the unification process was largely led by the Kingdom of Prussia under Chancellor Otto von Bismarck. Through a series of wars and political manoeuvres, Bismarck succeeded in uniting the various German states into a single nation, creating the German nation-state in 1871. Similarly, in Italy, the unification process known as the Risorgimento led to the unification of several small states and kingdoms into a single Italian nation in 1861. This process was guided by various leaders and political movements, the most notable of which was probably Giuseppe Garibaldi and his Army of a Thousand.

Empires have had a significant presence in European and world history, often extending over immense territories and encompassing a multitude of ethnic, linguistic and religious groups. These imperial states, unlike nation states, were not based on a single, shared national identity, but were often the result of conquest and territorial expansion. The German Roman Empire, which existed from the tenth century until its dissolution in 1806, was a complex political structure comprising numerous kingdoms, duchies, principalities, free cities and other political entities. Despite its name, it was not a homogeneous empire, but rather a collection of more or less autonomous territories that were united under the authority of the Germanic Roman Emperor. The Ottoman Empire, for its part, was one of the most powerful empires in history, extending at its height over three continents (Europe, Asia and Africa) and lasting for more than six centuries (from the end of the 13th century until the end of the First World War in 1918). This empire was a mosaic of peoples of different religions, languages and cultures, and its governance was often marked by tensions between the imperial centre (the Sublime Porte) and the provinces. Managing ethnic, religious and linguistic diversity was often a major challenge for these empires. While some adopted policies of assimilation or suppression of local identities, others opted for more decentralised systems of governance, allowing a degree of autonomy to different regions or ethnic groups. However, tensions and conflicts were often inevitable, particularly during periods of crisis or imperial decline.

Both nation states and empire states have had profound and lasting influences on the course of European and world history.

The emergence of nation states has often been linked to national liberation movements and the assertion of a specific national identity. These movements have often been inspired by ideals of freedom, democracy and self-determination. Nation states are often seen as the ideal framework for democracy, as they allow a community of people with a common language, culture and history to govern themselves. However, they have also often been marked by internal conflict and ethnic tensions, particularly in cases where national borders do not correspond to ethnic divisions.

Empire states, on the other hand, have often been associated with imperialism and foreign domination. They have been characterised by centralised and often authoritarian systems of government, and have often been built by force and conquest. However, they also created areas of stability and relative peace, and often encouraged trade and cultural exchange over vast regions. In addition, some empires established relatively efficient systems of administration and left lasting legacies in the fields of art, science and philosophy.

Traditional Nation-States[modifier | modifier le wikicode]

The United Kingdom[modifier | modifier le wikicode]

The United Kingdom played a central role in European and world politics during the 20th century, thanks to its industrial and naval power, its vast colonial empire and its dominant position in world trade and finance. The Industrial Revolution, which began in the UK at the end of the 18th century, transformed the British economy and enabled the country to become the "factory of the world". British industry, based on coal and iron, produced a wide range of manufactured goods that were exported around the world. The UK was also a world centre for technological and scientific innovation, with advances in fields such as engineering, chemistry and biology. As the world's leading naval power, the UK controlled key sea routes and protected its commercial interests around the world. Its navy played a key role in the defence of the British Empire, which spanned every continent and included territories such as India, Canada, Australia, South Africa and many islands in the Caribbean and the Pacific. However, the United Kingdom also faced challenges during the nineteenth century. The question of Ireland, where a large proportion of the population aspired to independence, was a constant source of tension. In addition, the rise of new industrial powers, notably Germany and the United States, began to challenge the United Kingdom's dominant position at the end of the century. At the same time, social and political movements within the UK, such as the universal suffrage movement and the workers' movement, also challenged the status quo and led to significant changes in British society.

Austria[modifier | modifier le wikicode]

Austria was a continental empire that played an important role in Napoleon's defeat. It was ruled by Emperor Francis I, who was also King of Hungary and Bohemia. By the end of the 18th century, Austria was a major power in Europe and its capital, Vienna, was an important cultural centre. At the Congress of Vienna, Metternich, the Austrian Foreign Minister, played a decisive role in the reorganisation of Europe. He was in favour of a balance of power between the great European powers to avoid any one state dominating the others. He also wanted to restore the old monarchical regimes and crush any hint of revolution. As a result, the Congress of Vienna was to redraw the map of Europe by re-establishing the monarchies deposed by Napoleon and creating new nation states such as Belgium and Norway. Despite this, Austria was to experience difficulties during the 19th century, particularly with the nationalist movements that emerged in the various territories of the Empire, which was made up of many different ethnic groups. This internal instability weakened Austria and contributed to its defeat in the First World War.

Austria was a major power in Europe for several centuries, playing a central role in European affairs. The Austrian Foreign Minister, Prince Metternich, was an influential figure at the Congress of Vienna in 1814-1815, which sought to restore the balance of power in Europe after the Napoleonic Wars. Metternich was a staunch defender of the monarchy and opposed any form of revolution or radical change. However, Austria's multinational empire included many different ethnic groups, including Hungarians, Czechs, Poles, Croats, Serbs, Italians and Germans, among others. This created internal tensions, as many groups aspired to greater autonomy or independence. These tensions erupted in the revolutions of 1848, which shook the empire but were eventually suppressed. Nevertheless, these tensions persisted throughout the nineteenth century and contributed to the instability of Austria-Hungary, as the empire became known after the Austro-Hungarian Compromise of 1867. Ultimately, these tensions, combined with external challenges such as rivalry with Prussia and the rise of Serbian nationalism, led to the collapse of Austria-Hungary during the First World War.

Prussia[modifier | modifier le wikicode]

Prussia played an important role in the coalition against Napoleon. After an initial defeat by Napoleonic France at the Battle of Jena-Auerstedt in 1806, Prussia was forced to submit to Napoleon and become a satellite state of the French Empire. However, Prussia finally broke its ties with Napoleon and joined the anti-Napoleonic coalition in 1813. Prussia's participation in the war of the Sixth Coalition was decisive in Napoleon's eventual defeat. Prussian forces played a key role in several important battles, including the Battle of Leipzig in 1813, also known as the "Battle of the Nations", which marked a turning point in the war against Napoleon. In 1815, Prussian forces, commanded by Field Marshal Gebhard Leberecht von Blücher, played a crucial role in helping British and Allied troops achieve final victory over Napoleon at the Battle of Waterloo. Prussia's participation in Napoleon's defeat greatly enhanced its position and prestige in Europe. It paved the way for its later role in the unification of Germany under Prussian leadership in the decades following the Napoleonic Wars.

Prussia played a key role in the unification of the German states in the 19th century under the leadership of Chancellor Otto von Bismarck. The creation of the German Empire in 1871 marked a turning point in European history. Germany became a major economic and military power in Europe, competing with the continent's other great powers, in particular the United Kingdom and France. German unification took place against a backdrop of international tensions and rivalries. The Franco-German War of 1870-1871 not only marked the end of the French Second Empire, but also triggered a series of conflicts and tensions in Europe that led to the First World War. France's loss of Alsace-Lorraine was a persistent source of tension between France and Germany, which ultimately contributed to the outbreak of war in 1914. Overall, the formation of Germany as a nation state profoundly transformed the balance of power in Europe and had a major impact on European and world history in the 20th century.

France[modifier | modifier le wikicode]

After the fall of Napoleon in 1815, France was forced to focus on internal reorganisation and consolidation, which included a series of revolutions and regime changes. However, it continued to extend its influence on a global scale through its colonial empire, which expanded considerably during the 19th century. In Europe, France has maintained a significant cultural influence, often being regarded as the cradle of the arts, literature and philosophy. Cities such as Paris served as a focal point for artistic and cultural movements, attracting artists, writers and thinkers from all over the world. Despite its internal political challenges, France also underwent significant economic modernisation during the 19th century. With the development of industry and railways, it saw significant economic growth. However, defeat at the hands of Prussia in the Franco-Prussian War of 1870-1871 had a major impact on France's status as a major European power. The loss of Alsace-Lorraine was a major blow to France, and this defeat eventually led to the end of the Second Empire and the establishment of the Third Republic. This event marked a turning point in French history and served as a catalyst for a period of national introspection and reform.

Recently Affirmed Nation-States[modifier | modifier le wikicode]

Germany[modifier | modifier le wikicode]

German unification was a complex and conflict-ridden process that took place over several decades. It was largely orchestrated by the Kingdom of Prussia and its Chancellor, Otto von Bismarck. Bismarck used both diplomacy and military force to unify the various German states under Prussian hegemony. One of his strategies was to mobilise German nationalism to unite the German states against common enemies. This was clearly illustrated in the wars against Austria in 1866 (known as the Austro-Prussian War or the Seven Weeks War) and against France in 1870 (the Franco-Prussian War). Interestingly, German unification was a major source of tension in Europe. Austria, which had a large German-speaking population, was not included in the new German Empire. This created some ambiguity about Germany's identity as a nation state and was a source of conflict in the decades that followed.

Italy[modifier | modifier le wikicode]

Like Germany, Italy was unified in the mid-nineteenth century, after a series of wars and diplomatic manoeuvres. The movement for Italian unification, known as the Risorgimento, was largely inspired by the ideals of nationalism and liberalism. Italian-speaking populations were scattered across various independent states and kingdoms, as well as territories under foreign control, particularly the Austrian Empire. The Italian Wars of Independence, which took place between 1848 and 1866, were mainly directed against Austria and enabled Italy to gain independence and unification. However, the unification of Italy was incomplete. Some regions with Italian-speaking populations, such as Trentino and Istria (the "Irredent Lands"), remained under Austrian control. These territorial claims were a source of tension in international relations, and Italy eventually succeeded in annexing these territories after the First World War. It is also true that the unification process was often led by a political and military elite, with limited popular participation. However, nationalist sentiment was fairly widespread among the Italian-speaking population, which contributed to the success of unification.

The Structure and Role of Empire States[modifier | modifier le wikicode]

The multinational empires[modifier | modifier le wikicode]

Multinational empires were quite common in Europe at the time, and they often represented a challenge in terms of managing ethnic, linguistic and religious diversity. The Russian Empire, the Ottoman Empire and Austria-Hungary - are good examples of these challenges. The Russian Empire, which spanned much of Eurasia, included many different ethnic and linguistic groups, including Russians, Ukrainians, Belorussians, Tatars, Georgians, Armenians, Jews and many others. The empire was mainly Orthodox, but also had a large Muslim population, particularly in the Caucasus and Central Asia. The Ottoman Empire was even more ethnically and religiously diverse. It included Turkish, Arab, Kurdish, Greek, Armenian, Jewish and other ethnic groups. The Empire was predominantly Muslim, but also included significant Christian and Jewish populations. Austria-Hungary, also known as the Austro-Hungarian Monarchy, consisted of two separate entities - Austria and Hungary - which were linked by a personal union under the rule of the Austrian Emperor and the Hungarian King. Each entity had its own administration, legislation and education system. Austria-Hungary was also ethnically and linguistically diverse, with Germans, Hungarians, Czechs, Slovaks, Poles, Ruthenians (Ukrainians), Romanians, Croats, Serbs and other ethnic groups. In all these empires, internal tensions were a constant feature, as different groups sought to preserve their culture, language and religion, and often also to gain greater autonomy or independence. These tensions ultimately contributed to the dissolution of these empires after the First World War.

The Congress of Vienna in 1815, which redrew the map of Europe after Napoleon's defeat, re-established the monarchical system in many countries and sought to preserve the balance of power in Europe. This order was led by the great powers of the day - Austria, Russia, Prussia and the United Kingdom - and is often referred to as the "Metternich System" after the Austrian chancellor who played a key role at the Congress of Vienna. This system sought to control the nationalist and revolutionary movements that had spread across Europe following the French Revolution and the Napoleonic Wars. The rulers of the time feared that these movements would destabilise their own countries and threaten the established order. However, this policy of repressing nationalist movements and aspirations for independence often had the opposite effect, fuelling resentment and exacerbating tensions. Over the course of the nineteenth century, these tensions erupted several times, leading to revolutions and wars of independence in many parts of Europe. These conflicts ultimately undermined Metternich's system and led to the rise of the modern nation states we know today.

Nationalism was a key factor in destabilising the established order in Europe during the nineteenth and early twentieth centuries. In many multinational empires, different nationalities began to claim their right to self-determination, leading to internal tensions and, in some cases, revolutions and wars of independence. Austria-Hungary, for example, was a multinational empire made up of many different nationalities, including Hungarians, Czechs, Slovaks, Croats, Serbs, Romanians and others. Each of these groups had its own cultural and linguistic identity, and many aspired to have their own independent nation-state. These nationalist aspirations led to internal tensions and conflicts, and ultimately contributed to the collapse of the empire after the First World War. Similarly, in the Ottoman Empire, the various nationalities under Ottoman rule - notably the Greeks, Armenians and Arabs - began to demand their independence, contributing to the destabilisation of the empire. Finally, imperialism and colonial rivalries between the great European powers also contributed to the rising tensions that led to the First World War. Each power sought to extend its influence and secure its interests, often at the expense of the others, leading to a series of alliances and counter-alliances that ultimately triggered the outbreak of the conflict in 1914.

The Austro-Hungarian Empire[modifier | modifier le wikicode]

The Austro-Hungarian Empire, under the leadership of the House of Habsburg, was a major player in Europe for several centuries. However, in the late 19th and early 20th centuries, the empire faced a series of internal and external challenges that eventually led to its collapse. Within the empire, ethnic and nationalist tensions intensified. Many ethnic groups, including Czechs, Slovaks, Serbs, Croats, Romanians and Hungarians, began to demand greater autonomy or even total independence. These tensions were exacerbated by the Austro-Hungarian duality of 1867, which granted more autonomy to Hungary but left many other ethnic groups dissatisfied. Outside the empire, Austria-Hungary also faced challenges. The Austro-Prussian War of 1866 marked a decisive turning point, with Prussia's victory asserting its supremacy over the German states and reducing Austria's influence. At the same time, the empire had to contend with the hostility of Russia and Italy, as well as competition from the Ottoman Empire for control of the Balkans. The outbreak of the First World War in 1914 exacerbated these internal and external tensions. Despite tenacious resistance, the Austro-Hungarian Empire was eventually defeated and imploded at the end of the war in 1918, giving rise to several new nation states in Central and Eastern Europe.

The Austro-Hungarian Empire faced many internal pressures due to the nationalist aspirations of its various ethnic communities. The Compromise of 1867, which created a dual monarchy by granting greater autonomy to Hungary, may have eased some problems, but it exacerbated others by fuelling the frustrations of other national groups who did not benefit from such privileged treatment. These internal tensions were compounded by a series of external problems, including rivalry with Russia, Italy and Prussia (later to become the nucleus of a united Germany). The defeat of Austria-Hungary in the Austro-Prussian War of 1866 marked a turning point, reducing Austria's influence in German affairs and leaving Prussia as the dominant power. The assassination of Archduke Franz Ferdinand in 1914 triggered the First World War, which finally sounded the death knell for the Austro-Hungarian Empire. At the end of the war, the empire was dismantled and replaced by a series of new nation states, including Czechoslovakia and Yugoslavia, reflecting the nationalist aspirations that had contributed to its downfall. These changes radically altered the political landscape of Central Europe and had profound repercussions on twentieth-century European history.

The Austrian Empire was seriously weakened after its defeat by Prussia in the Austro-Prussian War in 1866. This defeat not only strengthened Prussia's position as the dominant power in the German-speaking world, but also exacerbated internal tensions within the Austrian Empire. Emperor Franz Joseph I had to make concessions to Hungarian leaders, who had agitated for greater autonomy, in order to preserve the integrity of the empire. This led to the Compromise of 1867, which transformed the Austrian Empire into a dual empire, known as the Austro-Hungarian Empire. The Hungarian rulers were given a large measure of autonomy, including their own government and administration, although some matters, such as defence and foreign affairs, remained under common control. However, this solution did not satisfy the many other ethnic groups that made up the empire. Demands for autonomy and independence from various nationalities, including the Czechs, Slovaks, Romanians, Serbs and Ukrainians, continued to destabilise the Austro-Hungarian Empire, eventually contributing to its disintegration after the First World War.

The duality of the Austro-Hungarian Empire created internal tensions. While Austria and Hungary were linked by a common monarchy, each had its own parliament and administration. This structure led to a kind of competition between the two parts of the empire, each seeking to preserve and extend its own interests. This situation was complicated by the fact that the empire was also populated by a large number of other nationalities, who were unhappy with their minority status and sought greater autonomy or even independence. Nationalism played a crucial role in the weakening of the Austro-Hungarian Empire. Many ethnic groups within the empire were influenced by the pan-Slav movement, which sought to unite all Slavic peoples under a single political entity. This was particularly evident in the Balkans, where the empire faced a series of crises and wars during the latter part of the 19th century. The First World War finally proved to be the final blow for the Austro-Hungarian Empire. After the empire's defeat in the war, the various nationalities that made it up managed to gain their independence, leading to the creation of several new states in Central and Eastern Europe.

The Russian Empire[modifier | modifier le wikicode]

The Russian Empire was an extremely large and diverse multinational state, spanning much of Eastern Europe, Northern Asia and Central Asia. Russians were the largest ethnic group and Russian was the official language of the empire. However, there were also a large number of other ethnic groups living in the Russian Empire, each with their own language, culture and traditions. These included Ukrainians, Byelorussians, Tatars, Jews, Poles, Balts (Lithuanians, Latvians, Estonians), Georgians, Armenians, Azerbaijanis, Kazakhs, Uzbeks, Turkmen and many others. However, the Russian Empire was not a multicultural state in the modern sense of the term. The various nationalities were generally subject to a policy of "Russification", which sought to promote the Russian language and culture at the expense of other cultures. This policy often created tensions between the Russian government and the various nationalities, and was one of the causes of the unrest that eventually led to the collapse of the Russian Empire in the Russian Revolution of 1917.

The early years of the 20th century were marked by a series of uprisings and revolutions that eventually led to the collapse of the Russian Empire. The 1905 revolution was triggered by a series of strikes, demonstrations and military uprisings. It was sparked by a combination of popular discontent with the Tsarist autocracy, dissatisfaction with economic conditions and reaction to Russia's defeat in the Russo-Japanese War. Although this revolution failed to overthrow the Tsar, it did lead to significant reforms, including the creation of a legislative assembly, the Duma. The 1917 revolution was a period of major political and social unrest that eventually led to the fall of the Russian Empire and the birth of the Russian Soviet Federative Socialist Republic. The revolution began in February (or March, according to the Gregorian calendar) with a series of strikes and demonstrations in Petrograd (now St Petersburg), which quickly developed into a national revolution. Tsar Nicholas II abdicated in March, ending more than 300 years of rule by the Romanov dynasty. These revolutions were fuelled by a variety of factors, including popular dissatisfaction with the Tsar's autocratic rule, economic hardship, social and ethnic tensions, and Russia's catastrophic losses in the First World War.

Imperial Russia was an ethnically and culturally diverse entity, made up of many different nationalities. Tensions between these different groups played an important role in the destabilisation and eventual disintegration of the Empire. During the 19th century, many of these nationalities began to develop a stronger nationalist sentiment. This was fuelled by a combination of factors, including the economic, political and cultural oppression of Imperial Russia, as well as the influence of European nationalist and liberal ideas. In particular, Poles, Finns, Balts, Ukrainians, Georgians, Armenians and various groups in Central Asia and the Caucasus all experienced significant nationalist movements. Some of these movements sought greater autonomy or cultural rights within the Russian Empire, while others sought total independence. When the revolution of 1917 broke out, many of these groups seized the opportunity to push their demands. In the chaos that followed, several national republics emerged, some of which succeeded in gaining lasting independence, such as Finland, Lithuania, Latvia and Estonia. Overall, the national liberation movements played a crucial role in the disintegration of the Russian Empire and helped shape the political landscape of Eastern Europe and Eurasia in the 20th century.

The Ottoman Empire[modifier | modifier le wikicode]

The Ottoman Empire became a major target of European imperialist ambitions during the 19th century. The empire, which had once been a major player on the European stage, was gradually weakened by a series of internal revolts, economic problems and wars with its European neighbours. The great European powers, seeking to extend their influence, waged a series of wars and diplomatic conflicts known as the "Eastern Question". These conflicts often revolved around the question of how to deal with the decline of the Ottoman Empire and how to divide up its vast territory. Each major power had its own interests in the Ottoman Empire. Russia, for example, was seeking to extend its influence in the Balkans and had a particular interest in gaining access to the Dardanelles and the Bosphorus to guarantee its fleet access to the Mediterranean. Similarly, Britain and France were also interested in protecting their trade routes and economic interests in the region. The involvement of the great powers often exasperated ethnic and religious tensions within the Ottoman Empire, helping to trigger a series of Balkan wars in the early 20th century. These wars further weakened the Ottoman Empire and paved the way for its eventual dismantling after the First World War.

The Ottoman Empire gradually lost control over various territories during the 19th century. For example, Greece gained its independence after the Greek War of Independence (1821-1832). Similarly, Serbia, Romania, Montenegro and Bulgaria gained increasing autonomy throughout the 19th century, culminating in complete independence following the Balkan Wars (1912-1913). In the 20th century, during the First World War, the Ottoman Empire aligned itself with the central powers (Germany, Austria-Hungary). With the defeat of the central powers in 1918, the Ottoman Empire also collapsed. The Treaties of Sèvres (1920) and Lausanne (1923) officially put an end to the Ottoman Empire, reducing Turkey to its current borders and dividing the rest of the Ottoman Empire between the Allied Powers.

The policy of the United Kingdom and certain other European powers towards the Ottoman Empire was guided by a mixture of rivalry and pragmatism. On the one hand, they wanted to control certain parts of the Ottoman Empire for their own interests. On the other, they were also concerned about the instability that might result from the collapse of the Empire. It was precisely this mix of interests that guided British policy towards the Ottoman Empire. The UK saw the Ottoman Empire as a useful "buffer state" against Russian expansion southwards, which could threaten India, the "pearl in the crown" of the British Empire. For this reason, for much of the nineteenth century, the UK sought to maintain the territorial integrity of the Ottoman Empire. This is known as the "policy of balance", which aimed to preserve a balance of power in Europe by preventing any country (including Russia) from becoming too strong. However, this policy changed over time, particularly with the opening of the Suez Canal, which made Egypt (an Ottoman territory) of vital importance to the UK. This led to the British occupation of Egypt in 1882. In addition, at the beginning of the 20th century, the threat posed by Germany began to replace the Russian threat in British foreign policy. This led to a realignment of alliances, and in the First World War the UK found itself at war with the Ottoman Empire, which had allied itself with Germany. After the war, the UK played a key role in the dismemberment of the Ottoman Empire, taking control of many of its former territories in the Middle East under League of Nations 'mandates'.

The European Balance of Power[modifier | modifier le wikicode]

The Congress of Vienna by Jean Godefroy.

The Congress of Vienna (1815)[modifier | modifier le wikicode]

The concept of a balance of power in Europe was central to the political and strategic thinking of European states in the 19th century. This balance was intended to prevent any single country dominating the continent and disrupting the stability of the region. This reflected a reaction to the Napoleonic Wars, when Napoleon's expansionist ambitions had destabilised the continent. The Congress of Vienna, which took place in 1814-1815 after the fall of Napoleon, was a key moment in establishing this concept of a balance of power. The European powers, in particular Austria, Russia, Prussia and the United Kingdom, redrew the map of Europe in the hope of creating a balance that would discourage future wars.

The main aim of the Congress of Vienna, which took place from November 1814 to June 1815, was to restore political and military balance in Europe after the upheaval caused by the Napoleonic Wars. This congress was a major attempt at multilateral diplomacy and the participants sought to restore the old order after the collapse of the Napoleonic Empire. One of the main decisions taken at the congress was to contain France to prevent it from causing further unrest in Europe. France's borders were reduced to what they had been in 1790, before the wars of the French Revolution. In addition, France's neighbours were strengthened. For example, the Netherlands was enlarged by incorporating Belgium to create a more powerful Kingdom of the Netherlands. Great Britain played a key role in the Congress. It was one of the great powers that helped defeat Napoleon, and it played an important role in the negotiations. With its extensive maritime and commercial empire, Britain was a key player in maintaining the balance of power in Europe.

During the 19th century, various diplomatic conferences and congresses were organised to manage international tensions and conflicts. These meetings were often dominated by the major European powers, who sought to maintain a balance of power and avoid large-scale war.

The Paris Congress (1856)[modifier | modifier le wikicode]

The Congress of Paris is precisely one significant event in nineteenth-century Europe that reflected the tension and concerns about the balance of power. The Congress of Paris (1856) is a notable example of how European powers sought to regulate conflict and avoid the domination of a single power. The Crimean War was an opportunity for the European powers to curb the expansion of the Russian Empire, seen at the time as a threat to the balance of power in Europe. The Congress of Paris attempted to introduce modern principles of international law. For example, the prohibition of privateering (i.e. allowing private ships to conduct hostilities in time of war) was established in the treaty. Despite the settlement of the Crimean War, persistent tensions in the Balkans and the question of the Orient continued to threaten peace in Europe, eventually leading to further conflicts in the region.

The Crimean War (1853-1856) was a significant moment in the history of the 19th century, not only in terms of its impact on the balance of European power, but also because of its repercussions on the conduct of war and international relations. The war pitted Russia against a coalition of states made up of France, the United Kingdom, the Ottoman Empire and the Kingdom of Sardinia. The main issue was control of the Bosphorus and Dardanelles straits, which were essential for Russia's access to the Mediterranean Sea. This was an issue of great strategic importance, as it affected Russia's ability to project its influence and maintain its presence in the Mediterranean. After several years of fighting, the warring parties concluded peace at the Congress of Paris in 1856. In the resulting treaty, Russia was forced to relinquish its claims to the territories of the Straits as well as Moldavia and Wallachia. The treaty also established the neutrality of the straits, allowing all merchant ships through in peacetime and prohibiting warships from entering in peacetime. These provisions greatly limited Russia's influence in the region and underlined the importance of maintaining the balance of power in Europe. However, as is common in diplomatic agreements, underlying tensions and unresolved ambitions continued to exist and helped to fuel future conflicts in the region.

The Treaty of Paris of 1856 marked the end of the Crimean War, with several important provisions aimed at maintaining peace and stability in Europe. In addition to the conditions mentioned concerning Russia, the treaty also established several other principles and rules:

  • The neutralisation of the Black Sea: The treaty stipulated that the Black Sea was neutral, meaning that no warships could be present there in peacetime. This provision limited Russia's influence in the region and was intended to prevent future conflicts.
  • The guarantee of the territorial integrity of the Ottoman Empire: The European signatory powers agreed to respect the territorial integrity of the Ottoman Empire, with the aim of preventing the break-up of the empire and any conflicts that might ensue.
  • Protection of Christians in the Ottoman Empire: The treaty also provided guarantees for the protection of Christians in the Ottoman Empire, which was a matter of concern for several European powers.
  • Recognition of Romania, Serbia and Montenegro: The treaty also recognised the independence of Romania, Serbia and Montenegro, which had previously been under the control of the Ottoman Empire.

However, although the Treaty of Paris brought a degree of stability to Europe in the short term, the underlying tensions between the European powers and nationalist aspirations in the Ottoman Empire and elsewhere persisted, leading to further conflict in the decades that followed.

The Congress of Berlin (1878)[modifier | modifier le wikicode]

The Treaty of San Stefano, signed on 3 March 1878 at the end of the Russo-Turkish War of 1877-1878, provided for major territorial concessions from the Ottoman Empire and created an autonomous Bulgarian state under Russian influence, extending into the Balkans. The European powers, in particular Great Britain and Austria-Hungary, were concerned about the imbalance of power this would create in the region and the increased influence of Russia. Consequently, they convened the Congress of Berlin in June and July 1878 to revise the terms of the Treaty of San Stefano.

The Congress of Berlin led to the signing of the Treaty of Berlin, which considerably reduced the size of the Bulgarian state created by the Treaty of San Stefano and placed part of its territories under the control of the Ottoman Empire or other European powers. The treaty also recognised the complete independence of Romania, Serbia and Montenegro from the Ottoman Empire, assigned Bosnia-Herzegovina to the administration of Austria-Hungary and granted Great Britain control of Cyprus. The Congress of Berlin and the resulting treaty were important events in the history of international relations, as they reconfigured the political map of the Balkans and had a significant impact on the balance of power in Europe. However, they failed to definitively resolve nationalist tensions and power rivalries in the region, which contributed to subsequent conflicts, including the Balkan Wars and the First World War.

The Congress of Berlin significantly altered the political landscape of the Balkans, while seeking to maintain a certain balance of power between the various European nations. The Bulgarian state, which had been considerably enlarged by the Treaty of San Stefano, was divided into three parts by the Treaty of Berlin. Bulgaria itself became an autonomous principality under Ottoman suzerainty, eastern Rumelia obtained autonomous status under the direct control of the Ottoman Empire, and Macedonia returned to the authority of the Ottoman Empire. The Congress of Berlin also extended the territory of Serbia and Montenegro and recognised their independence, as well as that of Romania. Austria-Hungary, for its part, obtained the right to occupy and administer Bosnia-Herzegovina, even though it officially remained a province of the Ottoman Empire. These changes had long-term consequences for the Balkans and for Europe in general, exacerbating nationalist tensions and territorial conflicts, and paving the way for future crises.

The Algeciras Congress (1906)[modifier | modifier le wikicode]

The Congress of Algeciras was convened on the initiative of German Chancellor Bernhard von Bülow following the Tangiers crisis of 1905, when Kaiser Wilhelm II declared his support for Moroccan independence, thereby challenging France's growing control over the country. This declaration led to a serious diplomatic crisis between France and Germany. At the Algeciras Congress, the majority of participating countries supported France's position. The result was recognition of France's "freedom of action" in Morocco, while officially maintaining the Sultan's sovereignty. Germany was forced to accept a compromise that included respect for commercial freedom in Morocco, as well as the establishment of an international police force led by French and Spanish officers to maintain order. The event was a diplomatic setback for Germany and contributed to the country's international isolation. It also marked a rapprochement between France and the United Kingdom, who had already drawn closer with the Entente Cordiale of 1904, reinforcing the opposition between the Allies (France, United Kingdom, Russia) and the Central Powers (Germany, Austria-Hungary, Italy) that was to lead to the First World War.

The Congress of Algeciras reflected and intensified the tensions between the great powers, particularly between France and Germany. While the Congress confirmed France's privileged position in Morocco, it also formalised a system of international control, in principle intended to guarantee the economic rights of other nations and preserve Morocco's formal independence. In practice, however, the Congress mainly validated France's growing influence over Morocco, which was perceived as a setback for Germany. This fuelled resentments and tensions that ultimately contributed to the escalation of hostilities that led to the First World War. It is also important to note that the Congress of Algeciras was an early example of US involvement in European affairs, foreshadowing its growing role on the international stage during the twentieth century.

The growing tension between the European powers at the beginning of the 20th century threatened the balance of power established at the Congress of Vienna. A major factor in this instability was the rapid rise of Germany as a major economic and military power under the leadership of Kaiser Wilhelm II and Chancellor Otto von Bismarck. Germany sought to expand its influence, which led to tensions with other great powers, particularly Britain and France. Growing nationalism in Europe also played an important role. Many populations began to claim their right to self-determination, which created tensions in regions such as the Balkans. In addition, the arms race, particularly between Germany and Great Britain, helped to create a climate of mistrust and rivalry. The development of new military technologies and the strengthening of armies have increased the potential for destruction in the event of conflict. All these factors contributed to an escalation of tensions that eventually led to the outbreak of the First World War in 1914, signifying the end of the European balance of power as conceived in 1815.

The Emergence of the New Global Powers[modifier | modifier le wikicode]

In the second half of the 19th century, the world began to experience a significant redistribution of power on a global scale. Both the United States and Japan began to emerge as influential global players.

The Spanish-American War marked a key stage in the United States' rise to power on the international stage. The US victory not only led to the annexation of Puerto Rico, Guam and the Philippines, but also confirmed America's status as a colonial power. It also formalised American domination of Cuba and gave the United States significant influence over the political and economic affairs of Latin America, notably through the Monroe Doctrine, which established Latin America as a sphere of American influence.

Japan, for its part, became a major world power after its victory over Russia in the Russo-Japanese War of 1904-1905. This war marked the first time that an Asian nation had defeated a European power in a modern military conflict, and it radically changed perceptions of the balance of power in the world. Japan further strengthened its position with the annexation of Korea in 1910.

These developments upset the traditional balance of power, creating a new dynamic in international relations and contributing to the complex tensions that led to the First World War.

The United States[modifier | modifier le wikicode]

The evolution of the United States between the end of the 18th century and the beginning of the 20th century is remarkable. The country went from being an isolated young nation to a world power. The great territorial expansion of the United States began in the early 19th century with the doctrine of "Manifest Destiny", a widely held belief that the United States was destined to expand across the North American continent. This ideology led to a series of territorial acquisitions, perhaps most notably the purchase of Louisiana from France in 1803, which doubled the size of the country. Other important territorial acquisitions include the purchase of Alaska from Russia in 1867 and the annexation of the Republic of Texas in 1845. At the same time as this territorial expansion, the United States experienced impressive demographic growth. Much of this population growth was due to immigration, with millions of people coming from Europe and elsewhere in search of a better life. Waves of immigration have also contributed to the diversity and vitality of American culture. Finally, the late nineteenth century ushered in the era of the 'Industrial Revolution', a period of rapid economic growth and technological innovation. The United States became a world leader in fields such as steel, oil and electricity, and major companies such as Standard Oil and Carnegie Steel dominated their respective sectors. All these factors, combined with a stable political system and a strong entrepreneurial spirit, enabled the United States to become a major global economic and military power at the dawn of the 20th century.

The rapid economic growth of the United States in the early 20th century was fuelled by a combination of factors, including the exploitation of vast natural resources, a large and increasingly skilled workforce, and major technological advances. The rapid industrialisation of the United States was supported by an abundance of natural resources, including coal, oil and various minerals, which provided the raw materials needed to fuel factories and machinery. In addition, a growing workforce - largely through immigration - provided the manpower to keep these industries running. The United States has also benefited from major technological and organisational advances. For example, Henry Ford's introduction of in-line assembly in the car industry revolutionised the manufacturing process and enabled goods to be produced more efficiently and at lower cost. As a result of this economic growth, the United States also gained in political influence. After the First World War, it became a major player on the international stage, playing a leading role in the formation of new international institutions such as the League of Nations, although it ultimately chose not to become a member. This influence grew even stronger after the Second World War, when the United States became one of the world's two superpowers, alongside the Soviet Union.

The territorial expansion of the United States was a major factor in its rise as a world power in the late nineteenth and early twentieth centuries:

  • Alaska: The United States bought Alaska from Russia in 1867 for $7.2 million. This transaction, often referred to as "Seward's folly" after the Secretary of State William H. Seward who orchestrated it, added 1.5 million km² of territory to the United States. Alaska became the 49th US state in 1959.
  • Hawaii: The Hawaiian Islands became a territory of the United States in 1898, following the revolution of 1893 that overthrew Queen Lili'uokalani. Hawaii was annexed mainly for economic and strategic reasons. It became the 50th state of the United States in 1959.
  • Cuba, the Philippines and Puerto Rico: These territories were ceded to the United States by Spain at the end of the Spanish-American War in 1898 under the Treaty of Paris. However, Cuba was granted independence in 1902, although the United States retained certain rights of intervention and control of Guantanamo Bay. The Philippines gained independence in 1946, after the Second World War. Puerto Rico remained an unincorporated territory of the United States.

The foreign policy of President Theodore Roosevelt, who was in office from 1901 to 1909, played a key role in this development. His maxim, "Speak softly and carry a big stick", captures his foreign policy, often referred to as the "big stick policy". Roosevelt believed in peaceful engagement with other nations, but was prepared to use force, if necessary, to protect US interests. As part of this policy, Roosevelt worked to strengthen the US military presence, notably by sending the "Great White Fleet" on a world tour from 1907 to 1909 to demonstrate US naval power. He also used this approach in his management of the Panama Canal, the construction of which was a major achievement of his administration.

The territorial expansion of the United States at the end of the 19th century greatly contributed to its transformation into a world power. The acquisition of new territories and resources boosted the American economy, and the construction of naval bases in these territories extended the country's military reach. The aggressive foreign policies of presidents like Theodore Roosevelt also played an important role. Roosevelt, for example, supported the construction of the Panama Canal, which improved the United States' ability to project its naval power around the world. In addition, technological innovation and rapid industrialisation made the United States the world leader in industrial production in the early 20th century. These factors, combined with a rapidly growing population, gave the United States the means to exert its influence on a global scale. It is important to note that this rise to power was also accompanied by tensions and conflicts, both domestically and internationally. Ultimately, however, these developments laid the foundations for the United States' status as a superpower in the 20th century.

Japan[modifier | modifier le wikicode]

The Meiji era (1868-1912) in Japan was a period of profound and rapid transformation. Isolated for more than two centuries under the Tokugawa shogunate's policy of sakoku (national isolation), Japan was forced to open up to the outside world following the arrival of Commodore Matthew Perry's black ships from the United States in 1853. The Meiji Restoration in 1868 marked the start of a rapid process of modernisation and westernisation. The new government launched numerous reforms to modernise the country along Western lines, including the construction of modern infrastructure, the adoption of new technologies, the introduction of a universal education system, and the reorganisation of the army and navy along Western lines. These reforms transformed Japan from a feudal country into a modern industrial and military power in the space of a few decades. This enabled Japan to become the first non-Western power to defeat a modern Western power in the Russo-Japanese War of 1904-1905. This victory established Japan as a world power and changed the balance of power in East Asia.

In the late nineteenth and early twentieth centuries, Japan adopted an aggressive expansionist policy in East Asia and the Pacific. After the First Sino-Japanese War (1894-1895), Japan acquired Taiwan and the Pescadores Islands. Japan's victory over Russia in the Russo-Japanese War (1904-1905) not only established Japan as a world power, but also gave it control of Korea and certain territories in Manchuria. In 1910, Japan officially annexed Korea, which remained a Japanese colony until the end of the Second World War in 1945. During the First World War, Japan seized the opportunity to extend its influence in China and the Pacific. After the attack on Pearl Harbor in 1941 and for much of the Second World War, Japan controlled a vast empire that stretched across much of East Asia and the Pacific.

The Meiji Restoration, which began in 1868, marked a period of rapid modernisation and industrialisation in Japan. It was a time of great change, as the country moved from an isolated feudal system to a modern structure of governance and economy. These changes had a significant impact on Japan's position in the world. During this period, Japan also began to establish a colonial empire. The Sino-Japanese War of 1894-1895 marked an important stage in this expansion. Japan's victory and the resulting Treaty of Shimonoseki considerably increased Japan's influence in East Asia. Taiwan became a Japanese colony and Korea's independence was recognised, paving the way for increased Japanese influence and domination in the decades that followed. Japan's rapid modernisation, combined with its imperialist ambitions, saw the country rise to great power status in the late nineteenth and early twentieth centuries.

The Russo-Japanese War was a turning point not only in the history of Japan, but also in that of the world, challenging the unchallenged dominance of the European powers. Thanks to its rapid and effective modernisation, Japan was able to inflict a series of surprising defeats on Russia. Particularly significant was the decisive victory at the Battle of Tsushima, where the Russian fleet was virtually wiped out. The subsequent Treaty of Portsmouth recognised Japan's territorial gains in Korea and Manchuria. It marked the beginning of a new era in international relations, in which a non-European nation was able to take its place among the great powers. It also stimulated Japanese nationalism and strengthened Japan's position as a colonial power in Asia. However, it also sowed the seeds of future conflict, particularly with the United States, as a result of the expansion of Japanese influence in East Asia.

These developments in the early twentieth century marked the beginning of a profound shift in the global balance of power. While Europe was still at the centre of world affairs, the rise of the United States and Japan began to challenge this dominance. The United States, with its vast territory, growing population and ability to adopt and innovate in industrial technology, was able to surpass the European powers in many economic areas. Their influence was not limited to the economy: they also intervened significantly in the political affairs of Latin America and began to assert themselves as a major naval power. As for Japan, its rapid modernisation and victory over Russia not only transformed the country into a major regional power, but also challenged the conventional wisdom that European powers were militarily superior. This not only enhanced Japan's international status, but also set an example for other non-Western countries seeking to modernise. The rise of these two powers was one of many factors contributing to the growing instability in the run-up to the First World War, a period marked by increased tensions and rivalries between the great powers.

The Era of Colonial Expansion[modifier | modifier le wikicode]

The 19th century saw a significant increase in the size of colonial empires, particularly those of the European powers. In 1800, these empires controlled around 35% of the earth's surface, but this figure had risen to 85% by 1914. Colonial conquest was one of the major phenomena of the 19th century. Almost all the European powers embarked on this venture, and the consequences were considerable. The 19th century saw unprecedented colonial expansion, often referred to as the "New Imperialism". This phenomenon was largely driven by economic, political and strategic factors. Economically, the Industrial Revolution increased the demand of European powers for cheap raw materials and markets for their manufactured goods. The colonies offered not only valuable natural resources, but also captive markets for goods produced in Europe. Politically and strategically, the possession of vast colonial empires was seen as a sign of prestige and power. Rivalry between European powers often led to races to acquire and consolidate colonies, with each seeking to outdo the others. This often led to tension and conflict, including the Boer War in South Africa and the Fashoda Crisis in East Africa.

At that time, imperialism and colonialism were major elements of the foreign policy of many world powers. The prevailing idea was that the most powerful nations had the right, indeed the duty, to extend their influence and control over weaker territories. This belief was often underpinned by notions of racial or cultural superiority, as well as a desire for economic gain. The British Empire, one of the largest in history, developed a complex administration to govern its many colonies. Britain also introduced many aspects of its culture and institutions into the territories it controlled, effects that persist to this day. Similarly, France established a vast colonial empire, particularly in Africa, where it imposed its language and culture. The natural resources of these colonies were exploited for the benefit of the metropolis. Germany, which was a more recent state in Europe, established several colonies in Africa and the Pacific, although its colonial empire was less extensive than those of France or Great Britain. Outside Europe, the United States and Japan became colonial powers in the late nineteenth and early twentieth centuries. The United States acquired territories such as the Philippines and Puerto Rico following the Spanish-American War, while Japan established an empire in East Asia, including Taiwan, Korea and parts of China.

Imperialism and colonialism are motivated not only by economic objectives, but also by political, strategic and symbolic aspirations. Politically and strategically, control of additional territories provided imperialist nations with additional military bases, trade routes and a greater ability to project their power on a global scale. Colonies could also act as buffers between the metropolis and potential enemies. On a symbolic level, owning colonies was often seen as a mark of greatness and prestige for a nation. It served to reinforce national sentiment and justify the political regime in power, by arguing that it was capable of obtaining and maintaining overseas colonies. The example of Germany is very relevant. As a recently unified country, Germany felt the need to demonstrate its power and legitimacy on the international stage. This led to a race to colonise and militarise, particularly in terms of building a powerful war fleet to rival that of Great Britain.

Colonisation was a major driver of nationalism in the colonising countries, partly because it reinforced a sense of national superiority and created a sense of common identity based on the domination of other peoples. The acquisition of foreign territories and resources was often presented as proof of a nation's greatness and power. In addition, colonisation created a sense of international competition between European powers, with each country seeking to outdo the others in terms of the number of colonies and territorial extent. It also fuelled nationalist sentiment, as citizens felt engaged in a global struggle for national supremacy. Finally, colonisation was often used to divert attention from domestic problems. For example, if a government faced social or economic unrest at home, it could launch a colonial campaign to divert public attention and create a sense of national unity. While colonisation strengthened nationalism in the colonising countries, it also sowed the seeds of nationalist movements among the colonised peoples. Faced with colonial oppression, many colonised peoples began to develop their own sense of national identity and to fight for independence.

The Establishment of Colonial Empires[modifier | modifier le wikicode]

The colonial empires[modifier | modifier le wikicode]

Colonisation has had devastating consequences for indigenous populations. In general, the colonisers sought to impose their own political, economic, social and cultural systems on the indigenous populations, often using force and repression. Indigenous cultures and languages were often suppressed, and colonised peoples were forced to adopt the colonisers' ways of life and beliefs. In addition, the natural resources of the colonies were exploited for the benefit of the economies of the colonising countries, often without regard to the needs or rights of the indigenous populations. Indigenous populations were often forced to work in extremely harsh conditions and exploited to extract these resources. Colonisation has also often led to deep and lasting inequalities. The colonisers generally established systems of segregation and discrimination, where indigenous people were considered inferior and deprived of many fundamental rights.

Natural resources were one of the main motivations for colonisation. The main objective of colonising countries was often to exploit the natural resources of the colonies to fuel their own economies. This could include resources such as gold and other precious metals, diamonds, rubber, spices, timber, tea, coffee, cotton and many others. To maximise the exploitation of these resources, colonising countries often set up administrative and labour systems that were extremely exploitative and oppressive for the local populations. These systems often included forced labour, land confiscation, taxation and other forms of economic exploitation.

King Leopold II of Belgium is known to have instituted a particularly brutal and exploitative regime in the independent state of Congo, which was his personal property and not a colony of Belgium. Leopold's regime forced the local population to harvest wild rubber under extremely difficult conditions. Those who failed to meet the quotas were often punished by mutilation or death. It is estimated that millions of people died as a result of the brutal working conditions and diseases associated with forced labour. In Indochina and Africa, France also exploited natural resources, including coal, copper, rubber and timber. Forced labour systems were also established, and local populations were often forced to work in extremely difficult conditions. Great Britain, for its part, heavily exploited the resources of India and its African colonies. In India, the cotton industry and tea plantations were among the main sectors exploited by the British.

Britain and France were the two greatest colonial powers of the 19th century in terms of the size and population of their respective empires.

The British Empire, often described as "the empire on which the sun never sets", was the largest. It spanned every continent, including territories as diverse as India, Australia, Canada, various parts of Africa, as well as many territories in the Caribbean and the Pacific.

The French Empire, although not as large as the British Empire, was also extensive and included territories in North Africa (notably Algeria, Tunisia and Morocco), sub-Saharan Africa (French West Africa and French Equatorial Africa), Asia (notably Indochina), as well as America and the Pacific.

Germany, Italy and Belgium were newcomers to the colonisation race and had smaller colonial empires. The German colonial empire included territories in Africa (Togo, Cameroon, South West Africa, East Africa) and the Pacific. Italy had colonies in Africa (Eritrea, Italian Somalia, Libya). Belgium, although small, controlled the enormous and richly endowed Congo.

Spain and Portugal, which had been leaders in exploration and colonisation in the 15th and 16th centuries, had smaller empires by the 19th century. Spain still controlled territories in Africa (Western Sahara, Equatorial Guinea) and the Pacific, while Portugal had colonies in Africa (Angola, Mozambique, Guinea-Bissau) and Asia (East Timor, Goa).

It should also be noted that Russia, although not generally considered a colonial power in the classical sense of the term, also underwent significant territorial expansion in the 19th century, particularly in Asia.

The colonised world in 1914.

The British Empire[modifier | modifier le wikicode]

The British Empire was the largest in the world at its height, covering around 25% of the landmass and stretching across every part of the globe. The British Empire was truly a global empire, with territories on every continent. For more details:

  • In Asia, the British Empire controlled territories such as India (the "jewel in the crown"), modern-day Pakistan, Bangladesh, Malaysia, Singapore and Burma. India was particularly valuable to the Empire because of its wealth and population.
  • In Africa, the British Empire controlled vast territories, including Egypt, Sudan, Kenya, Uganda, Zambia, Zimbabwe, South Africa and many others.
  • In North America, even after losing the colonies that would become the United States, the British Empire retained Canada. The British also controlled territories in the Caribbean, such as Jamaica, the Bahamas and other islands.
  • In Oceania, Australia and New Zealand were under British control, as were several Pacific islands.
  • Even in Europe, the British controlled territories such as Malta and Cyprus, as well as strategic areas such as Gibraltar.

This vast empire enabled Britain to become a global superpower, with considerable cultural, economic, political and military influence.

The British Empire was made up of a variety of different territories, some of which were settlements, others exploitative colonies, and still others protectorates or mandates.

  • Settlements were generally territories where the British settled in large numbers, often because they were originally sparsely populated. These colonies often enjoyed a degree of political autonomy and were called dominions. Canada, Australia, New Zealand and South Africa were examples of such dominions.
  • Exploitation colonies were territories that the British controlled primarily for their economic resources. These colonies were usually ruled by a governor appointed by the British monarch and often had a large indigenous population that was subject to British rule. Examples of such colonies include India, Burma, Nigeria and Sudan.
  • Protectorates and mandates were territories that were not officially colonised by the British, but were under their protection or control. For example, Egypt and Sudan were protectorates, while Palestine and Transjordan were mandates conferred on Britain by the League of Nations after the First World War.

Each type of territory had a different status, and British laws and policies varied according to that status. However, in all these territories, the British exercised a degree of control and influence, whether through direct government, military protection or economic control.

The dominions of the British Empire gained greater autonomy during the nineteenth and early twentieth centuries, while remaining formally linked to Great Britain. This status enabled them to manage their own internal affairs while coordinating their foreign and defence policies with those of Great Britain. The Balfour Declaration of 1926 was a decisive moment in this development. It declared that the United Kingdom and its dominions were "equal in status, not subordinate to each other in any aspect of their internal or external affairs, though united by a common allegiance to the Crown, and freely associated as members of the British Commonwealth of Nations". This consolidated the principle that the Dominions were autonomous entities within the Empire, rather than subordinate possessions of Great Britain. Nevertheless, despite this formal declaration of equality, it remained true that the United Kingdom had a dominant influence over the foreign and defence policy of the Dominions, particularly until the Second World War. This was particularly evident in the First World War, when the Dominions were drawn into the conflict largely because of their link with Britain, although some Dominions such as Canada and Australia had a degree of autonomy in managing their war effort.

Small islands were often of disproportionate strategic importance to colonial empires. Their usefulness as naval bases, supply stations or trading posts has often outweighed their size or population. The Pacific Ocean is a good example of this dynamic. Many colonial empires established colonies or protectorates on Pacific islands to serve as staging posts for ships bound for Asia or Australia. For example, the British Empire established colonies in Fiji and the Gilbert and Ellice Islands (now Kiribati and Tuvalu), while France established a protectorate over Tahiti and other islands in French Polynesia. The Indian Ocean also saw similar competition for strategic islands. The British Empire took control of Mauritius and the Seychelles, which were key naval bases on the route to India, while France established control over Reunion Island and Madagascar. In addition, some islands may have had valuable natural resources that were attractive to colonial empires. For example, the islands of the South Pacific were often rich in phosphate, an important resource for the fertiliser industry, while the islands of the Caribbean and the Indian Ocean had a climate conducive to the cultivation of products such as sugar, coffee and spices.

The French Empire[modifier | modifier le wikicode]

At the height of its expansion, the French Empire was the second largest colonial empire in the world in terms of surface area, after the British Empire. At its peak in the early 20th century, it covered around 11.5 million square kilometres, or almost 8.7% of the planet's land surface.

The empire spanned several continents, including large tracts of land in Africa, as well as possessions in Asia, America and the Pacific Ocean. In Africa, France controlled vast territories such as Algeria, Tunisia, Morocco, Mauritania, Mali, Niger, Chad, Senegal, Côte d'Ivoire and many others. In Asia, it possessed what we now call Vietnam, Laos and Cambodia, which were collectively known as French Indochina. In the Americas, France controlled Guadeloupe, Martinique, French Guiana and Saint-Pierre-et-Miquelon. The French Empire was culturally and linguistically diverse, with populations ranging from the Berbers of the Maghreb and the Vietnamese of Indochina to the Peuls and Wolofs of West Africa. However, this empire was also marked by strong tensions and conflicts, and many of its former colonies fought for their independence during the twentieth century.

The French Empire had a significant presence in Africa and Asia, with vast territories colonised in these regions. In Africa, French possessions stretched across the continent, including territories such as Algeria, Morocco, Tunisia, Senegal, Mali, Niger, Chad, Côte d'Ivoire, Gabon, Central African Republic, Congo, Djibouti and Madagascar, to name but a few. In Asia, French Indochina was a collection of territories including what is now Vietnam, Laos and Cambodia. France also maintained a presence in West Asia, with the mandate of Syria and Lebanon after the First World War. Finally, the French Empire also had colonies in the Pacific, notably New Caledonia and French Polynesia. The empire was therefore truly global, stretching across several continents and regions of the world.

In North Africa, Algeria was seen as an extension of France itself rather than a colony, a feature reflected in its designation as a French department. This meant that, unlike the traditional French colonies, Algeria was subject to the same laws as metropolitan France, although Muslim Algerians were institutionally discriminated against and did not enjoy the same rights as French citizens until the end of the Algerian War of Independence. France also had a significant influence on formally independent states such as Morocco and Tunisia through the protectorate system. Although these countries retained their own monarchs, France controlled their foreign policy and domestic administration. In South-East Asia, French Indochina included Vietnam, Laos and Cambodia, which were administered as colonies or protectorates. These regions were governed by French representatives, who imposed economic and social policies according to French interests. Other French colonies in Africa, such as Senegal, Mauritania, Mali, Niger and others, were also administered directly by France and were used for their natural resources and as markets for French goods.

The Dutch Empire[modifier | modifier le wikicode]

The Dutch Empire was an important colonial power, particularly during the 17th and 18th centuries, although its influence began to decline at the end of the 19th century.

Indonesia, then known as the Dutch East Indies, was the largest and most profitable colony for the Dutch. It comprised much of what is now Indonesia, including key areas such as Java, Sumatra and the Sunda Islands. The Dutch intensively exploited the resources of these islands, including spices, rubber, tin and oil. In addition to Indonesia, the Dutch also controlled various other territories. They maintained trading posts and colonies in other parts of Asia, notably Ceylon (now Sri Lanka) and Malacca. However, many of these possessions were lost to the British during the 18th and early 19th centuries. In America, New Amsterdam (now New York) was originally a Dutch colony, but was ceded to England in 1664. However, the Dutch maintained colonies in the Caribbean, notably Aruba, Bonaire and Curaçao, as well as Suriname in South America, which they retained until the 20th century. In Africa, the Dutch established a colony at the Cape of Good Hope (now in South Africa) in the 17th century, but it was conquered by the British in the 19th century. The Dutch also controlled territories on the west coast of Africa, such as present-day Ghana, where they established forts to support the slave trade, but these territories were sold to the British in the 19th century.

Indonesia, then known as the Dutch East Indies, was the Netherlands' most valuable colonial possession. It was administered by the Dutch East India Company (VOC) from the 17th century until the early 19th century, and then by the Dutch government itself. The Dutch colonial system in Indonesia was characterised by economic exploitation, political oppression and social inequality. The Dutch exploited the archipelago's rich natural resources, including spices, rubber, tin and oil, for the benefit of the metropolis. They also introduced a system of forced labour, known as the "cultuurstelsel" (cultivation system), which forced Indonesian peasants to grow export crops to the detriment of their own food crops. Politically, the Dutch maintained a strict colonial regime and suppressed any form of Indonesian resistance or nationalism. This created a profound social inequality, with a Dutch colonial elite at the top of the hierarchy and the majority of the Indonesian population living in poverty and destitution. This colonial system lasted until the Second World War, when Indonesia was occupied by Japan. After the war, Indonesia declared independence in 1945, but the Dutch tried to regain control by force. A war of independence ensued, which lasted until 1949, when the Dutch finally recognised Indonesia's independence.

Suriname, formerly known as Dutch Guiana, was a colony of the Netherlands for more than three centuries. Located in South America, it is bordered by Guyana to the west, Brazil to the south and east, and the Atlantic Ocean to the north. The colony's economy was largely based on agriculture, with sugar cane, coffee, cocoa and cotton plantations run by African slaves. The abolition of slavery in 1863 led to the importation of contract workers from India, Indonesia and China, helping to make Suriname a multi-ethnic and multicultural society. Suriname became an autonomous country of the Kingdom of the Netherlands in 1954, before becoming fully independent in 1975. Today, although Suriname is independent, historical links with the Netherlands remain strong, with a large Surinamese diaspora living in the Netherlands and Dutch as the country's official language.

The Belgian Empire[modifier | modifier le wikicode]

The independent state of Congo, now known as the Democratic Republic of Congo, was administered by King Leopold II of Belgium as his personal property from 1885 to 1908. Leopold was able to convince the other European powers to grant him control of the Congo at the Berlin Conference of 1884-1885, claiming that he wanted to promote civilisation and the eradication of slavery in the region. However, the reality was very different. The regime of Leopold II put in place a brutal system of economic exploitation, particularly of the rubber harvest. The people of the Congo were subjected to forced labour, and often mutilated or killed if they failed to meet the production quotas set. It is estimated that several million people died as a result of Leopold's exploitation of the Congo. In 1908, under international pressure following revelations of abuses committed in the Congo, the Belgian government took control of the territory, which became the Belgian Congo. Although some of the most brutal practices were abolished, Belgium continued to govern the Congo as a colony until its independence in 1960. The legacy of this period continues to have a profound impact on the Democratic Republic of Congo today.

Belgian Congo gained independence on 30 June 1960, becoming the Republic of Congo, also known as Congo-Léopoldville to distinguish it from neighbouring French Congo, now the Republic of Congo or Congo-Brazzaville. The transition to independence was marked by tension and conflict. The Congo had not been prepared for autonomy by the Belgian colonial authorities, who had not expected independence so quickly and had not planned accordingly. So, at the time of independence, there were very few Congolese trained to run the country's political and administrative institutions. After independence, the Congo was plunged into a series of political crises and conflicts, including the secession of the rich mining province of Katanga, the assassination of Prime Minister Patrice Lumumba, and the seizure of power by army commander Joseph Mobutu. Mobutu reigned as dictator for more than three decades, until he was overthrown in 1997. The country was then renamed the Democratic Republic of Congo.

The Portuguese Empire[modifier | modifier le wikicode]

The Portuguese colonial empire was one of the most enduring, beginning in the 15th century with the discovery of West Africa by Prince Henry the Navigator, and extending into the 20th century. In Asia, the Portuguese established trading posts in Goa, Diu and Daman in India, Malacca in Malaysia and Macao in China. These colonies were important centres for the trade in spices and other precious goods. Goa was the largest and most enduring colony in Asia, remaining under Portuguese control until 1961. In Africa, the Portuguese colonised areas that are now Mozambique and Angola. There they exploited slave plantations and other natural resources. In South America, Brazil was the most important colony of the Portuguese empire. The Portuguese began colonising Brazil in the early 16th century and it remained a Portuguese colony until its independence in 1822. During this period, the Portuguese exploited Brazil's rich natural resources, including precious woods, gold, diamonds and sugar cane.

The Portuguese Empire had colonies in Africa that included Angola, Mozambique, Guinea-Bissau (then known as Portuguese Guinea), Cape Verde, Sao Tome and Principe and parts of what is now Namibia. Angola and Mozambique were the Portuguese Empire's most important colonies in Africa. The Portuguese began exploring and colonising these regions in the 15th century. They established trading posts along the coast and eventually took control of vast territories inland, where they exploited natural resources and set up plantations using slave labour. Guinea-Bissau, Cape Verde and Sao Tome and Principe were smaller but important colonies for the Portuguese. They used them mainly as ports of call for their ships en route to other colonies in Africa, Asia and South America. Portugal's colonial rule over these territories lasted until the middle of the 20th century. National liberation movements led to wars of independence in these countries, which became independent in the 1970s.

The Italian Empire[modifier | modifier le wikicode]

Italy was one of the last European powers to take part in the partitioning of Africa. Its colonial empire was relatively small compared with those of Britain and France, but it did include significant territories.

Eritrea and Italian Somalia (also known as Italian Somaliland) were Italian colonies on the east coast of Africa. Eritrea was the first colony to be acquired by Italy in 1890, while Somalia became a colony in 1908. These territories provided Italy with a strategic presence along the important trade route of the Suez Canal, as well as access to agricultural and mineral resources. Eritrea and Somalia provided Italy with a strategic position to control important trade routes along the Red Sea and the Indian Ocean. These colonies were also important for agriculture and the extraction of raw materials, which played an essential role in supplying the Italian economy. In Eritrea, the Italians built a network of railways and roads, as well as modern cities such as Asmara, which today is renowned for its Art Deco architecture. They also developed coffee and cotton plantations, exploiting the labour of the local population. In Somalia, the Italians also established agricultural plantations, mainly to produce bananas for export to Italy. The Italians also introduced new farming techniques and crops such as maize and citrus fruit.

Libya, on the other hand, was obtained as a result of the Italo-Turkish war of 1911-1912, during which Italy dislodged the Ottoman Empire from this territory. Libya was colonised as part of an effort to establish a "new Rome" in North Africa. Italy conquered Libya as part of the Italo-Turkish War, dislodging the Ottoman Empire from the territory. However, Italian control of Libya was far from peaceful. It was marked by intense local resistance, particularly during the Libyan War (1911-1932), which is often regarded as one of the longest and most costly colonial conflicts of the 20th century. Omar Mukhtar, a Libyan resistance leader, led a guerrilla campaign against the Italians. He succeeded in mobilising the tribes of the Cyrenaica region against the Italian occupation. Mukhtar was a skilled military strategist and managed to conduct effective guerrilla operations against the Italians for almost two decades. However, the Italians' military superiority, combined with their desire to crush the resistance at all costs, eventually led to Mukhtar's capture and execution in 1931. Libyan resistance continued for some time after his death, but the Italian occupation of Libya lasted until the Second World War, when Allied forces succeeded in expelling Italian and German forces from Libya. The Italian occupation had a profound impact on Libya, particularly in terms of its demography, economy and infrastructure. Italy encouraged the migration of Italian citizens to Libya, which changed the demographic composition of some parts of the country. The Italians also built roads, schools and other infrastructure, but they exploited Libya's resources for their own benefit.

These colonies remained under Italian control until the Second World War, when Allied forces dislodged the Italians from these territories. After the war, these territories became independent: Eritrea was initially annexed by Ethiopia before gaining independence in 1993, Somalia became independent in 1960, and Libya in 1951.

Russia[modifier | modifier le wikicode]

Russia's territorial expansion has been marked by a series of conquests and annexations of territories throughout its history. This expansion was often carried out by military means, and involved the integration of many different peoples and cultures into the Russian Empire. During the 19th century, Russia expanded eastwards into Asia and southwards into the Caucasus and Central Asia. This involved the conquest of vast territories, populated by many different ethnic groups. The consequences of this expansion are still visible today, particularly in the tensions that exist between the Russians and certain minority groups, such as the Chechens. Chechnya, located in the North Caucasus region, became part of the Russian Empire in 1859. However, relations between the Chechens and the Russian government have always been strained. The Chechens, with their distinct history, culture and religion, have often resisted Russian rule, and there have been several attempts at secession over the years.

In 1867, Russia sold Alaska to the United States for $7.2 million, a deal known as the 'Alaska Purchase'. At the time, some Russians criticised the sale, believing that Russia was abandoning a potentially valuable territory. However, Alaska was at the time a remote and difficult territory for Russia to administer. From the American point of view, the purchase of Alaska proved extremely beneficial in the long term. Alaska is rich in natural resources, including oil, natural gas, gold and fish. The discovery of gold in the territory at the end of the 19th century triggered a gold rush, and in the 20th century Alaska became a major source of oil for the United States. So although the Alaska Purchase was initially derided as "Seward's folly" (named after the US Secretary of State William H. Seward who orchestrated the deal), it is now generally regarded as an excellent deal for the US.

Japan[modifier | modifier le wikicode]

Both Japan and the United States established colonial empires from the nineteenth century onwards, although their colonial approach and ideology differed from those of European empires. Japan, having modernised and industrialised following the Meiji era, began looking for territories to colonise at the end of the nineteenth century. Taiwan and Korea became Japanese colonies in 1895 and 1910 respectively. Japan's colonial expansion continued in the 1930s and 1940s, with the invasion of Manchuria, China and various territories in the South Pacific. The United States, meanwhile, began acquiring colonies following the Spanish-American War of 1898. It gained control of Puerto Rico, Guam and the Philippines as a result of this war, and also annexed Hawaii in 1898. The United States also exercised control over other territories, such as Samoa and the Virgin Islands. However, the American ideology of "manifest destiny" and democratic traditions often created a tension between colonial objectives and national ideals.

The Meiji era in Japan, which began in 1868 and ended in 1912, was a period of rapid and radical modernisation. The Meiji government sought to establish Japan as a modern industrialised nation capable of competing with the Western powers. These modernisation efforts included massive political reform, the adoption of Western industrial technologies, the establishment of a Westernised education system, and the development of a modern army and navy. One of the main motivations behind these reforms was Japan's desire to avoid the fate of many other Asian countries that had been colonised or dominated by Western powers. Japan saw what was happening to countries like China and India and decided to adopt a policy of assimilation and adaptation of key aspects of Western culture, technology and organisation, rather than resistance. This enabled Japan not only to avoid colonisation, but also to become a colonial power itself. In 1895, Japan won the first Sino-Japanese war, which marked the beginning of Japanese imperialism in Asia. As a result, Japan acquired Taiwan and the Pescadores Islands. Later, in 1910, Japan annexed Korea, making it a colony. During the first half of the 20th century, Japan continued to expand its empire, occupying part of China (Manchuria) and many territories in the Pacific during the Second World War.

Japan began its imperialist policy with the annexation of the island of Taiwan in 1895 following victory in the Sino-Japanese War. Japan then acquired new colonies in Asia, notably Korea in 1910, as well as territories in the Pacific and China during the Second World War. In 1895, following the First Sino-Japanese War, Japan acquired Taiwan and the Pescadores Islands of China, marking the beginning of its imperial expansion. In 1905, following the Russo-Japanese War, Japan gained further territory, including China's Liaodong Peninsula (which includes Port Arthur, a major naval base) and Sakhalin Island to the north. It was the first time an Asian nation had won a major victory over a European power, and it radically changed the balance of power in the region. In 1910, Japan officially annexed Korea, ending the Joseon dynasty and establishing colonial rule. Japanese control of Korea was particularly brutal, with many cases of forced labour, cultural repression and other human rights abuses. In the 1930s and 1940s, Japan continued its expansion into China, including the invasion of Manchuria in 1931 and the establishment of a puppet state called "Manchukuo". This led to wider conflicts with China and eventually to Japan's entry into the Second World War. During the Second World War, Japan conquered large areas of the Pacific and South East Asia, including the Philippines, Indonesia, Malaysia, Singapore and much of Burma. However, these territorial gains were lost when Japan surrendered to the Allies in 1945.

Japan's colonial empire was dismantled at the end of the Second World War, and the country was forced to relinquish all its overseas territories under the Treaty of San Francisco in 1951.

The United States[modifier | modifier le wikicode]

After independence, the United States pursued a policy of territorial expansion on its own continent, known as "Manifest Destiny". This policy held that the United States was destined to expand from coast to coast across the North American continent. This led to the annexation of vast tracts of land, including the Louisiana Territory in 1803, Florida in 1819, Texas in 1845 and the south-western territories following the Mexican-American War of 1846-1848. However, it was towards the end of the 19th century that the United States began to establish colonies outside its continent, adopting a form of imperialist policy. This was fuelled by various factors, including the desire for new economic opportunities, the need to establish military bases abroad in support of the Monroe Doctrine (which aimed to prevent interference by European powers in the affairs of the Americas) and the influence of certain ideologies, such as Social Darwinism.

The Spanish-American War of 1898 led the United States to acquire several Spanish territories, including the Philippines, Puerto Rico, Guam and Cuba. These acquisitions marked a break with past US policy, which had focused primarily on expansion in North America. The annexation of these territories provoked heated debate in the United States. Some Americans, including many members of the Anti-Imperialist Party, condemned these actions as contrary to the democratic and anti-colonial principles on which the nation had been founded. However, others, such as President Theodore Roosevelt, supported expansion as a demonstration of national greatness and a means of competing with European empires on the world stage. The US also annexed Alaska (bought from Russia in 1867) and Hawaii (which became a US territory in 1898 after the Hawaiian monarchy was overthrown by American settlers in 1893).

After the Second World War, the United States began to distance itself from traditional colonialism and chose to promote its influence through economic and political means rather than through the direct occupation of foreign territories. This was done in the context of decolonisation, as many former colonies gained their independence. That said, the US continued to maintain certain territorial possessions, such as Puerto Rico, Guam, the Northern Mariana Islands, the US Virgin Islands, and the remote minor island in the Pacific Ocean. Although these territories are not colonies in the traditional sense of the term, they remain under US sovereignty and their inhabitants are US citizens. However, they do not enjoy all the same rights as citizens residing in the 50 States - for example, they cannot vote in presidential elections unless they reside in one of the States. Furthermore, American strategy in the twentieth century evolved to become more economic and diplomatic, with a strong emphasis on trade agreements, financial aid, political and military alliances, and the promotion of democracy and human rights. These strategies helped establish the United States as a global superpower, despite the decline of its colonial empire.

Rivalry and competition: the Race for Colonies[modifier | modifier le wikicode]

The aspiration to conquer new territories gave rise to intense rivalry between different colonial powers. In their quest to extend their sphere of influence and domination, the colonial powers targeted the most strategic and richest territories. This gave rise to a veritable "race for colonies" from the second half of the nineteenth century to the beginning of the twentieth, involving major European powers such as France, the United Kingdom, Germany, Italy and Portugal, as well as Japan and the United States. Their expansion was often at the expense of the indigenous populations of these territories.

Africa became a particularly hotbed of this competition, as the colonial powers sought to appropriate the continent's abundant natural wealth, including raw materials such as rubber, diamonds, gold and oil. Colonial rivalry helped inflame tensions and provoke major conflicts, such as the Boer War in South Africa (1899-1902), triggered by the dispute between the United Kingdom and Boer settlers over control of gold and diamond mines; or the Italo-Ethiopian War (1935-1936), when Mussolini's fascist Italy invaded Ethiopia, one of the few African countries to have resisted European colonisation, in a bid for national prestige and a desire to control Ethiopia's resources; and the Franco-Tunisian War (1881), which led to the establishment of a French protectorate over Tunisia, motivated by security concerns and economic interests in Tunisia, such as olive oil, wheat and mining.

In addition, competition between these great powers was a contributing factor to the outbreak of the First World War, with colonial issues exacerbating tensions between European nations.

The Berlin Conference: Partition of Africa[modifier | modifier le wikicode]

Representation of the Berlin Conference (1884), attended by representatives of the European powers.

The Berlin Conference, also known as the West Africa Conference, was held from November 1884 to February 1885 in Berlin, Germany. The meeting was intended to ease tensions and resolve problems arising from colonial rivalries among the various European powers. The main objective was to divide Africa into zones of influence and territories to be colonised, thus defining the rules of the game for the Race to Africa.

The conference, initiated by German Chancellor Otto von Bismarck, brought together 14 nations, including all the major European powers of the time, as well as the United States. During the conference, the participants drew up regulations concerning the annexation of African territories, stipulating that any territorial claim had to be notified to the other powers and that the claiming power had to occupy the territory concerned. This conference had a major impact on the history of Africa, leading to the arbitrary drawing of borders and the division of the continent between the European powers. This partition, which largely ignored existing ethnic and cultural realities in Africa, had long-term consequences for the continent's political, social and economic development.

The decisions taken at the Berlin Conference catalysed the colonisation of Africa by the European powers. By establishing rules for the division of Africa, the conference paved the way for the accelerated occupation and annexation of the continent. After the conference, the map of Africa began to resemble a patchwork of colonies controlled by different European powers. For example, France took control of large areas of West and Central Africa, the United Kingdom extended its hold over East and Southern Africa, while other countries such as Germany, Portugal, Italy and Belgium also acquired important territories.

Otto von Bismarck, as German Chancellor, had a dual objective at the Berlin Conference. On the one hand, he sought to ease tensions with France, which was still unhappy about the loss of Alsace-Lorraine as a result of the Franco-Prussian War. Bismarck hoped that supporting French colonial expansion in North Africa would distract France from its desire to retake Alsace-Lorraine. On the other hand, Bismarck's ambition was to strengthen the international status of the newly unified Germany. He wanted Germany to be recognised as a legitimate colonial power by the other European nations. So, at the Berlin Conference, Germany laid claim to several territories in Africa, including Togo and Cameroon in West Africa, as well as German South-West Africa (present-day Namibia) and German East Africa (comprising parts of present-day Burundi, Rwanda and Tanzania). Bismarck had some success in achieving these goals.

The Berlin Conference established a framework for the organisation of the colonisation of Africa, delimiting the zones of influence of the various European colonial powers on the African continent. However, this major historical event also amplified the rivalries between these same powers. Colonial greed led to tensions and conflicts between the various nations, particularly as they expanded into newly acquired territories. For example, intense competition crystallised between Great Britain and France in North Africa, with Egypt and Sudan the main stakes. Similarly, antagonism between Great Britain and Russia manifested itself in clashes in Central Asia, particularly around Afghanistan. Germany and France also expressed their colonial rivalry in West Africa, where they battled for control of Togo and Cameroon. These colonial rivalries created a climate of uncertainty and tension in Europe, a precarious atmosphere that eventually led to the outbreak of the First World War. Colonial conflicts soured relations between the European powers, dragging them into an all-out war for control of colonial territories. This historical context shows the extent to which colonial issues were a determining factor in the international tensions that led to the outbreak of the Great War.

The Impact of the Colonisation of Africa[modifier | modifier le wikicode]

Fichier:Egypt sudan under british control.jpg
British Egypt and Sudan. This 1912 map shows the site of Fachoda (Kodok) to the south, on the Nile.

At the dawn of the 18th century, the vast majority of African regions were governed by autonomous political entities, each with its own distinct cultures, languages and political systems. While Europeans had succeeded in establishing trading posts and coastal colonies, most of the interior of the continent remained largely inaccessible to their influence. Over the years, however, the European powers gradually increased their presence in Africa. Their means of asserting their influence on the continent were varied, ranging from military force to the imposition of political and economic controls. This gradually transformed the political map of Africa as the European powers expanded their colonial empires.

In Africa, the colonial powers also found themselves competing to extend their territories. The official start of the colonisation of Africa by these European powers was recorded at the Berlin Conference of 1884-1885. This meeting led to an arbitrary division of the African continent between European nations, with no regard for the traditional borders or distinct cultures of the various African ethnic groups. The rivalries that resulted from this partition led to several armed conflicts for control of specific regions of Africa. For example, the Boer War in South Africa pitted the British against the Afrikaners, descendants of Dutch settlers, for control of the gold and diamond mines. Similarly, the Italian-Ethiopian War of 1895-1896 was sparked by Italy's colonial ambitions in Ethiopia, one of the few African nations that had resisted European colonisation. These conflicts illustrated the brutality of colonial competition, with lasting repercussions on African societies.

As well as using military force, the European powers also employed indirect methods to increase their hold on Africa. For example, they signed treaties with local rulers, established protectorates and created zones of influence. Although these methods may have seemed more subtle, they still resulted in a loss of sovereignty for the people of Africa. The impact of colonisation on these populations was devastating. Africans were dispossessed of their land and natural resources. In addition, European settlers often exploited the African workforce, forcing them to work in difficult conditions and for derisory pay. In addition, colonisation often led to the suppression of local cultures and traditions. Europeans sought to impose their own culture, language and religious beliefs, thus contributing to the erosion of African cultural identities.

At the beginning of the twentieth century, Africa had been divided up between the European powers, defining specific zones of influence for each of them. However, this division did not put an end to rivalries and tensions, and conflicts continued to erupt over control of certain regions. These ongoing power struggles reflect the intensity of colonial ambition at the time, as each nation sought to maximise its control and influence over the African continent.

Britain and France, as the dominant colonial powers, sought to expand their sphere of influence in Africa during the nineteenth century. Over time, the British Empire consolidated its hold on territories such as Egypt, Sudan, South Africa, Southern Rhodesia (now Zimbabwe) and various parts of East Africa. For its part, France extended its hold in West Africa, encompassing Senegal, Mali, Côte d'Ivoire, Niger, Burkina Faso and Guinea, as well as in Central Africa with Chad and Congo-Brazzaville, not forgetting East Africa with Djibouti and French Somalia.

One of the most notable illustrations of the rivalry between these two great colonial powers was the Fachoda crisis in 1898. This episode saw France and Great Britain squabbling over control of the Upper Nile region, an area of major strategic importance. Despite the risk of escalating into armed conflict, the situation was eventually resolved peacefully through diplomatic compromise, underlining the importance of negotiations in settling colonial disputes.

France's colonisation of Tunisia in 1881 raised tensions with Italy, which also had colonial ambitions for the territory. Italy, with a large community of Italians living in Tunisia at the time and significant commercial interests, hoped to use Tunisia as an extension of its sphere of influence in North Africa. France's success was therefore perceived by Italy as a missed opportunity, fuelling a rivalry between the two nations. This tension was a contributing factor in Italy's subsequent quest for colonial expansion in Africa, notably with the conquest of Libya in 1911 and Ethiopia in the 1930s under Mussolini.

Under Kaiser Wilhelm II, Germany adopted a policy of colonial expansion and rivalry with the other European powers, particularly Britain and France. This policy, known as Weltpolitik, aimed to make Germany a world power on a par with its competitors. The Moroccan crisis of 1905-1906, also known as the First Moroccan Crisis, is a clear example of these colonial tensions. Germany opposed French control over Morocco, putting forward the principle of free trade and challenging France's dominance over the territory. However, at the Algeciras conference in 1906, which aimed to resolve the crisis, the majority of the participating countries supported France's position, thus isolating Germany. This conflict not only exacerbated tensions between Germany and France, but also highlighted the rivalries between the European powers for control of colonial territories. It also led to a strengthening of the Entente Cordiale between France and Great Britain, as they sought to thwart Germany's colonial ambitions.

The dismantling of the Ottoman Empire[modifier | modifier le wikicode]

During the 19th century, the Ottoman Empire, nicknamed "the sick man of Europe", was in constant decline, weakened by a series of internal problems such as economic difficulties, ethnic tensions and religious conflicts. As a result, European powers, including Britain, France and Russia, sought to take advantage of this weakness to increase their influence in the territories of the Empire.

The Crimean War (1853-1856) is a clear example. This conflict pitted Russia against a coalition comprising the Ottoman Empire, the United Kingdom, France and the Kingdom of Sardinia. One of the underlying reasons for the conflict was the struggle for control of the Holy Places of Christianity in the Holy Land, then under Ottoman control. The conflict revealed the military weakness of the Ottoman Empire and the interest of the major European powers in dismantling it. In Central Asia, the rivalry between Russia and the United Kingdom, known as the "Great Game", centred on control of Afghanistan and the surrounding regions. Both powers feared that an advance by the other would offer a strategic advantage in the region. Tensions came to a head during the Second Anglo-Afghan War (1878-1880), when the UK sought to counter Russian influence by establishing a favourable regime in Kabul. At the same time, the Russo-Turkish War of 1877-1878 demonstrated the Ottoman Empire's inability to resist a Russian invasion. The Treaty of San Stefano that ended the war was largely in Russia's favour, which alarmed the other major powers and led to a revision of the treaty at the Congress of Berlin in 1878. These geopolitical rivalries not only exacerbated tensions between the great European powers, but also triggered a series of wars and conflicts in the territories of the Ottoman Empire, the consequences of which helped to shape the Middle East and the Balkans as we know them today.

Several factors contributed to this situation, including the rise of European power, the Industrial Revolution, internal conflicts, wars and revolts. The Industrial Revolution, which began in the 18th century in Britain before spreading to Europe and beyond, created a great disparity in economic and military power. European countries were able to use their industrial advantage to build powerful armies and fleets, and were able to establish colonial empires across the world. Meanwhile, the Ottoman Empire remained largely agrarian and feudal, with no significant industrial capacity. Internally, the Ottoman Empire was also plagued by problems. Uprisings broke out across the empire, such as the Serbian uprising of 1804-1815, the Greek War of Independence of 1821-1830, and the Bulgarian, Armenian and Arab revolts later in the 19th century. These uprisings not only drained the empire's resources, but also exposed its weakness to the outside world. Moreover, military defeats, such as in the Russo-Turkish War of 1877-1878, weakened the Ottoman Empire's international position. As a result, the great European powers, such as Great Britain, France, Russia, and later Germany and Italy, began to compete for influence over the Ottoman Empire. This led to what is often referred to as the "Eastern Question" - a diplomatic debate about how the European powers should deal with the decline of the Ottoman Empire. This created a complex web of alliances and rivalries between the European powers, contributing to the international tension that eventually led to the First World War. The Ottoman Empire subsequently collapsed after its defeat in the First World War, and the modern Republic of Turkey was founded in 1923.

The Balkan Wars were an intense conflict that led to a major redistribution of power in the Balkan region.

The Ottoman Empire lost much of its territory in the Balkans to the Balkan states of Bulgaria, Serbia, Montenegro and Greece, which had allied themselves in the First Balkan War (1912-1913) against the Ottoman Empire. However, these allies soon quarrelled over the division of the conquered territories, triggering the Second Balkan War (1913) in which Bulgaria fought its former allies and eventually lost part of the territory it had won in the first war. The Balkan Wars exposed the Ottoman Empire's military weaknesses and showed that the Ottoman Empire was in rapid decline. They also created instability and tension in the Balkan region, which eventually escalated into the First World War. After the First World War, the Ottoman Empire was completely dismantled, and its remaining territories were divided between the victorious Allied Powers, mainly Great Britain and France, under the terms of the 1920 Treaty of Sèvres. These powers created mandates to administer the territories, creating Syria and Lebanon under the French mandate, and Iraq and Palestine under the British mandate. This division of the Middle East had lasting consequences for the region, some of which are still felt today.

The Italo-Turkish War of 1911-1912, also known as the Tripolitan War, marked an important stage in the disintegration of the Ottoman Empire. Italy was seeking to assert itself as a colonial power and saw Ottoman Libya (then known as Tripolitania and Cyrenaica) as an opportunity to do so. The Ottoman Empire, already weakened and having problems controlling its vast territories, was unable to effectively resist the Italian invasion. The war was finally resolved by the Treaty of Lausanne (1912), which confirmed Italy's annexation of Libya. Italy also took control of the Dodecanese islands in the Aegean Sea. This was a major defeat for the Ottoman Empire and a further sign of its decline. The loss of Libya not only weakened the Ottoman Empire, but also shifted the balance of power in the Mediterranean in Italy's favour. It would be one of many territorial losses for the Ottoman Empire over the next two decades.

The discovery of vast oil reserves in the Middle East played a significant role in the international politics of the early twentieth century. Oil was identified as a strategically vital resource for the economy and security of industrialised nations, and obtaining and controlling its supply became a major foreign policy objective for many powers. The major European powers, particularly Britain and France, sought to establish control and influence over oil-producing regions such as Persia (modern Iran) and Iraq. Control of these regions was essential to fuel their economies and naval fleets. This led to new rivalries and tensions as nations fought over control of oil-rich areas. For example, the Sykes-Picot Agreement of 1916, which divided the Middle East between France and Britain, was largely motivated by the desire to control access to oil resources.

Despite its natural resources, including oil, the Ottoman Empire failed to modernise sufficiently to compete with the great European powers in the late 19th and early 20th centuries. Its inability to implement effective reforms, corruption, mismanagement and political instability contributed to its economic and military decline. The discovery of oil transformed the geopolitics of the region. The great powers, in particular Great Britain and France, realised very early on the strategic importance of oil for warfare and industrialisation. They therefore sought to secure access to these resources, either through direct colonisation or through protectorates and agreements with local leaders. For example, the British Anglo-Persian Oil Company (which later became BP) obtained a concession to explore for oil in Persia (modern-day Iran) in 1901. Later, the French company Compagnie française des pétroles (now Total) obtained exploration rights in the Middle East following the Sykes-Picot Agreement in 1916. These developments not only exacerbated rivalries between the great European powers, they also accelerated the decline of the Ottoman Empire and contributed to the rising tensions that led to the First World War. It also had a lasting impact on the region, which remained at the centre of international conflicts over the control of oil throughout the twentieth century.

The Stakes of the Far East[modifier | modifier le wikicode]

The Far East was an area of major imperial rivalry, particularly at the turn of the 20th century. Russia's growing influence in the region, particularly in Manchuria and Korea, was of concern to Britain and Japan. Russia sought to secure access to the Pacific Ocean, which would give it an independent eastern route out of the often frozen Arctic route. Britain, for its part, saw Russian expansionism in Central Asia as a threat to its own interests in India, the "jewel in the crown" of the British Empire. As for China, it had been the object of the appetite of the colonial powers since the mid-nineteenth century. Great Britain had imposed unequal treaties on China following the Opium Wars, giving it access to the Chinese market. France, Germany, Russia and Japan subsequently obtained similar concessions. Japan, for its part, was seeking to become an imperialist power in its own right. Its victory over Russia in the Russo-Japanese War of 1904-1905 was a key moment, enabling it to establish its dominance in Korea and strengthen its presence in Manchuria. These rivalries in the Far East contributed to the rise in international tensions at the beginning of the 20th century. They also had a lasting impact on the region, contributing to the emergence of conflicts such as the Russo-Japanese War, the First and Second World Wars, and the subsequent conflicts in Korea and Vietnam.

The Russo-Japanese War of 1904-1905 had major international implications. One of the most significant consequences was the reorganisation of the balance of power in the Far East. Until then, Russia had been perceived as a major force in the region. Its defeat at the hands of Japan, a non-Western country that had modernised with impressive speed since the Meiji Restoration in 1868, took the world by surprise. It showed for the first time that a non-European power could defeat a major European power in a major military conflict. Japan emerged from the war with an enhanced status, being recognised as a major world power. It gained control of Korea (which it officially annexed in 1910) and the Russian territory of Port Arthur in Manchuria. In addition, Japan's victory had an impact on non-Western colonies and countries around the world. It stimulated nationalist movements in several Asian countries, notably India and China, which saw Japan's victory as proof that resistance against Western imperialism was possible. However, the Russo-Japanese war also led to an escalation of tensions in the Far East. Japan's rise to power created anxiety among the other colonial powers, notably the United States, and laid the foundations for other conflicts in the region, including the Second World War in the Asia-Pacific.

The geopolitical situation in Afghanistan was marked by the "Great Game", an intense strategic and political rivalry between the British Empire and the Russian Empire for control of Central Asia in the 19th century. Afghanistan, with its strategic geographical position, was seen by the British as an essential bulwark for the protection of their colonial jewel, India. The Russians, for their part, saw Afghanistan as a potential stage in their expansion to the south and east. The Second Anglo-Afghan War (1878-1880) was a direct consequence of these rivalries. The British, fearing growing Russian influence on the Afghan regime, invaded Afghanistan in 1878. After a series of battles, the Treaty of Gandamak was signed in 1879, guaranteeing Afghanistan a degree of autonomy while bringing its foreign policy under British control. These events had a lasting impact on Afghanistan and the surrounding region. They contributed to a long period of instability and conflict in the country, and defined Afghanistan's role as a contested zone of influence within the wider framework of international rivalries. Subsequently, the involvement of the great powers in the region persisted throughout the twentieth century and into the twenty-first, with significant consequences for the history of Afghanistan.

In the 19th century, the Western powers used their military superiority to force China to open up to their commercial activities. The unequal treaties, which were highly disadvantageous to China, granted the foreign powers numerous rights, including the establishment of concessions where they exercised extraterritorial jurisdiction, the opening up of numerous ports to international trade, and costly war indemnities. The Opium War, triggered by China's refusal to allow the opium trade, led to the first series of unequal treaties, most notably the Treaty of Nanking in 1842, which not only forced China to legalise the opium trade, but also ceded Hong Kong to the British and opened several ports to foreign trade. The Sino-Japanese War of 1894-1895 marked the rise of Japan as a colonial power. China was forced to recognise the independence of Korea, previously a Chinese tributary, and to cede Taiwan and the Pescadores Islands to Japan. The Boxer Rebellion, an anti-Western rebellion, was crushed by an alliance of eight foreign nations, further strengthening their influence and control over China. These events not only weakened the Qing dynasty and exacerbated China's internal problems, but also caused a national humiliation that had a lasting impact on China's collective consciousness. This ultimately contributed to the emergence of modern nationalism in China and the fall of the Qing dynasty in 1911.

South America was seen as a kind of exclusion zone for European powers because of the Monroe Doctrine, which was a policy of the US administration to prevent European powers from interfering in the affairs of the Western Hemisphere. In enunciating the Monroe Doctrine in 1823, President James Monroe declared that the United States would regard any European intervention in the affairs of America's independent nations as an unfriendly act against the United States. This doctrine served as the basis for US foreign policy in Latin America for over a century and has been invoked on several occasions to justify US intervention in regional affairs. By contrast, in other parts of the world, such as Africa, Asia and the Pacific, the European powers have been much more active in establishing colonies and spheres of influence, often at the expense of local populations. This has often led to conflicts and rivalries between these powers, which have been a major source of instability and international tension.

Establishing Alliance Systems[modifier | modifier le wikicode]

At the beginning of the 20th century, the alliance system played a crucial role in the development of the international political situation. The emergence of the Triple Entente and the Triple Alliance created a political and military polarisation in Europe, with two blocs of powers facing each other. The Triple Entente, formed by France, Russia and the United Kingdom, sought to counter the perceived threat of the Triple Alliance, made up of Germany, Austria-Hungary and Italy. However, it is important to note that Italy had a somewhat ambiguous position, having signed a secret alliance with France in 1902. The system of alliances intensified rivalries between these powers and contributed to an atmosphere of mistrust and suspicion. Each side sought to strengthen its own military capabilities to protect itself against possible aggression from the other. In addition, colonial disputes and imperialist ambitions also fuelled tensions between these powers. Ultimately, these rising tensions led to the First World War in 1914, when the assassination of Archduke Franz Ferdinand of Austria in Sarajevo triggered a series of events that dragged most of the major European powers into the conflict.

The alliance system played a major role in the expansion of the First World War. When a conflict broke out between a Triple Entente power and a Triple Alliance power, it quickly led to the involvement of all the powers of both alliances. The assassination of Archduke Franz Ferdinand of Austria in June 1914 by a Serbian nationalist served as the detonator. Austria-Hungary, supported by Germany, declared war on Serbia. Russia, Serbia's ally, then went to war against Austria-Hungary. France and the United Kingdom, Russia's allies in the Triple Entente, soon declared war on Germany and Austria-Hungary. Italy, despite its membership of the Triple Alliance, chose to remain neutral before joining the Entente in 1915. Other countries, such as the Ottoman Empire (allied with Germany) and Japan (allied with the United Kingdom), also became involved in the conflict. In 1917, the United States entered the war on the side of the Entente. The war quickly became a global conflict, making the First World War one of the most destructive wars in history. Millions of people were killed and many parts of the world were ravaged.

The Role and Impact of the Triple Alliance[modifier | modifier le wikicode]

La Triple Alliance entre l'Allemagne, l'Autriche-Hongrie et l'Italie.

The term "duplicity" is used to refer to the alliance between Germany and Austria-Hungary that existed before the First World War.

The Three Emperors Alliance, which included Germany, Austria-Hungary and Russia, was signed in 1873. However, this alliance was not renewed in 1887 due to growing disputes between Russia and Austria-Hungary. In 1879, Germany and Austria-Hungary formed the Duplice, a secret alliance aimed at countering Russia's growing influence in Eastern Europe. Italy joined this alliance in 1882, creating the Triple Alliance. The Treaty of Reassurance, signed in 1887, was a separate agreement between Germany and Russia. This agreement helped to maintain peace between the two countries, despite their belonging to different alliance systems. However, this treaty was not renewed in 1890, which eventually led to estrangement between Russia and Germany and an approach between Russia and France, culminating in the formation of the Franco-Russian Alliance in 1894.

The alliance between Germany and Austria-Hungary, known as the Duplice, was signed in 1879. The alliance was partly born out of a shared fear of Russian expansion in Europe. Both were worried about the possibility of war on two fronts: Germany feared a confrontation with France and Russia, while Austria-Hungary was concerned about Russia and Italy. By entering into this alliance, they hoped to discourage such a situation. In 1882, Italy joined the alliance, which then became the Triple Alliance. Italy was motivated by the fear of French expansion in North Africa and sought the support of Germany and Austria-Hungary for its own colonial ambitions. However, it should be noted that Italy's commitment to the alliance was less solid, as Italy had unresolved territorial claims against Austria-Hungary. When the First World War broke out, Italy initially declared its neutrality, before joining the Allies in 1915 following the signing of the Pact of London, which promised Italy territorial gains after the war.

The 1881 agreement uniting Germany, Austria-Hungary and Russia failed to last, due to divergent interests between the three nations. Russia, which saw itself as the protector of the Slavic peoples in the Balkans, came into conflict with the ambitions of Austria-Hungary, which aspired to hegemony in the same region. Faced with this impasse, a new pact was formed in 1882, this time between Germany, Austria-Hungary and Italy, giving rise to the Triple Alliance. This treaty was intended to counterbalance the Triple Entente, an alliance made up of France, Russia and Great Britain. It also stipulated that each signatory would provide military support to the others in the event of external aggression.

Italy's entry into the Triple Alliance marked an important milestone in the country's history, as it was the first time it had participated in such a collective security agreement with major European powers. Italy, newly unified and relatively weak compared to other great powers, was looking for powerful allies to protect its interests, and Germany and Austria-Hungary offered that security. Moreover, Italy's membership of the Triple Alliance was part of a wider strategy of colonial expansion. At the end of the nineteenth century, Italy was seeking to establish its own colonial empire, mainly in North Africa. Tunisia, just across the Mediterranean from Sicily, was a particularly attractive target for Italy. However, France also had its eye on Tunisia, which led to tensions with Italy. Therefore, by joining the Triple Alliance, Italy hoped to gain the support of Germany and Austria-Hungary to counter French influence in Tunisia and other parts of North Africa. However, Italy's colonial ambitions in North Africa met with considerable resistance, particularly from France, and led to tensions within the Alliance.

Italy was part of the Triple Alliance with Germany and Austria-Hungary, but its participation in the alliance was complex and fraught with contradictions. In 1882, Italy had joined the Triple Alliance in an attempt to protect itself against possible French aggression and to gain support for its colonial ambitions. However, Italy also had many differences with its allies, in particular with Austria-Hungary, which controlled territories that Italy considered to be part of its "irredent Italy", notably Trentino and South Tyrol. At the start of the First World War, Italy chose to remain neutral, arguing that the Triple Alliance was essentially a defensive alliance, and that since Austria-Hungary had been the aggressor by declaring war on Serbia, Italy was not obliged to support it. Italy was subsequently lured to the side of the Triple Entente (France, the United Kingdom and Russia), which promised significant territorial gains in Austria-Hungary as part of the London Accords of 1915. When Italy entered the war on the side of the Triple Entente in May 1915, it marked a major reversal of alliances in Europe and further widened the scope of the war. It also showed how alliances could be subject to rapid change depending on circumstances and perceived opportunities.

The First World War was fought between two major blocs: the Central Powers and the Triple Entente. The Central Powers, sometimes referred to as the Central Empires, consisted mainly of the German Empire, the Austro-Hungarian Empire and, initially, the Kingdom of Italy. However, as discussed earlier, Italy left this alliance in 1915 to join the side of the Triple Entente. Other notable members of the Central Powers were the Ottoman Empire and the Kingdom of Bulgaria. The Triple Entente was formed by the French Republic, the United Kingdom and the Russian Empire. As the war progressed, other nations, including Italy, Japan and the United States, joined their cause. The resulting conflict was a total war that involved not only military forces but also civilian populations, and had repercussions on every aspect of society. It also led to the fall of the German, Austro-Hungarian, Russian and Ottoman empires, and redrawn the political map of Europe and the Middle East.

The Formation and Influence of the Triple Entente[modifier | modifier le wikicode]

Triple Entente.jpg

Although the Triple Entente was not a formal military alliance like the Triple Alliance, it did serve to unite France, Russia and the United Kingdom against the threat of the Central Powers. The Entente Cordiale between France and the United Kingdom in 1904 improved relations between the two countries, which had historically been fraught with colonial rivalries. This agreement mainly resolved colonial disputes in North Africa, leading to greater cooperation between the two nations. At the same time, France and Russia signed a series of agreements between 1891 and 1894, culminating in the Franco-Russian Alliance. These agreements included a mutual assistance clause in the event of an attack by Germany or one of its allies. The United Kingdom, having resolved its colonial differences with France and watched the German threat grow, signed an agreement with Russia in 1907, known as the Anglo-Russian Convention. This agreement resolved their differences in Central Asia and strengthened anti-German sentiment among the three countries. These agreements helped to create a climate of mutual trust and cooperation between the three countries, strengthening their ability to respond collectively to the threat from the Central Powers.

The Franco-Russian Alliance, concluded in 1892 and officially ratified in 1894, was an essential pivot in the foreign policy of these two countries. Indeed, it was of vital importance in the run-up to the First World War. Economically, the alliance was beneficial to both sides. France was a major investor in Russia, providing financial support for the country's industrial and railway development. In return, Russia offered a vast market for French goods and services. On the military front, the treaty stipulated mutual assistance in the event of an attack by Germany or one of its allies. This provision reflected growing concerns about Germany's growing power in the European context. Diplomatically, the alliance helped to break France's international isolation following its defeat in the Franco-Prussian War of 1870-1871. For Russia, the alliance brought it closer to Western Europe. The Franco-Russian alliance was renewed in 1899 and continued until the First World War, when it played a key role in the outbreak of the conflict.

The Entente Cordiale of 1904 marked a key stage in the improvement of relations between France and the United Kingdom, putting an end to centuries of colonial rivalry and mistrust. The UK's recognition of France's sphere of influence in Morocco and France's recognition of the UK's sphere of influence in Egypt was a major step in consolidating this new friendly relationship. In 1907, the Entente Cordiale was extended with the addition of Russia, forming the Triple Entente. This agreement between Russia and the United Kingdom was designed to resolve their differences in Central Asia and Persia. It also provided for cooperation in the event of aggression by Germany or Austria-Hungary against one of the signatories. This series of agreements thus created a solid alliance between these three major powers, which ultimately played a key role in the outbreak of the First World War. The main objective of this alliance was to counter the growing threat posed by Germany and Austria-Hungary in the European context of the time. The Triple Entente therefore comprised France, Russia and the United Kingdom, and was directed against Germany and the Austro-Hungarian Empire.

The Anglo-Russian agreement of 1907 represented a major turning point in relations between the United Kingdom and Russia, two powers that had had major disputes in the Far East, particularly over Iran, Afghanistan and Tibet. These territories were seen as strategic buffers by the British, who wanted to protect their colonial jewel, India, from Russian ambitions. Under this agreement, the two countries succeeded in establishing zones of influence in Iran, recognised the independence of Afghanistan and agreed not to intervene in Tibet. The British recognised Russian political and economic interests in Iran, while the Russians undertook not to interfere with British interests in India. The easing of tensions between Russia and the United Kingdom paved the way for the formation of the Triple Entente, which also included France. This alliance was fundamental to the balance of power in Europe on the eve of the First World War.

Great Britain and Japan concluded a naval agreement in 1902, known as the Anglo-Japanese Alliance. This agreement was motivated by the desire of these two powers to stem Russian expansion in the Far East, more specifically in the region of Manchuria and Korea. Under the terms of the agreement, if either party was at war with two or more powers, the other party would have to come to its aid. In addition, each party undertook to remain neutral if the other was at war with another power. The renewal of the Anglo-Japanese Alliance in 1905 and 1911 marked an important stage in Britain's foreign policy in the Far East, as it not only strengthened its position in the region, but also weakened Russia. The agreement also played a crucial role in the Russo-Japanese War of 1904-1905, in which Japan emerged victorious, strengthening its position in Asia and asserting its status as a world power.

The existence of these alliances played a major role in the escalation of tensions at the beginning of the 20th century. The mutual obligation to defend one's allies created a kind of constant pressure and tension, where every aggressive act or political move was scrutinised through the prism of these alliances. This pressure led to an arms race and military escalation that paved the way for the First World War. The situation was further complicated by the complex and sometimes secretive nature of these alliances. For example, the outbreak of the First World War was largely caused by the assassination of Archduke Franz Ferdinand of Austria in Sarajevo in 1914. Because of its alliance obligations with Austria-Hungary, Germany declared war on Russia and France. This set off a chain reaction, with each country declaring war on those who threatened their allies, ultimately leading to a world war. This situation was also exacerbated by the bellicose and expansionist attitude of certain powers, notably Germany. Feeling that it had the support of its allies, Germany adopted an aggressive foreign policy, which helped to increase tensions. So the alliance systems, while intended to preserve peace by ensuring a balance of power, actually contributed to the escalation of tensions and ultimately led to war.

The First World War: The Suicide of Europe[modifier | modifier le wikicode]

The First World War is considered to be one of the deadliest conflicts in history, with an unprecedented scale of destruction. The conflict began with the assassination of Archduke Franz Ferdinand of Austria-Hungary in Sarajevo in June 1914, an event that triggered a series of military mobilisations and declarations of war between the major European powers due to their respective systems of alliances. The United Kingdom, France and Russia formed the Allies, also known as the Triple Entente. Other nations, including Italy, Japan and, later, the United States, joined the Allies during the war. On the other hand, Germany, Austria-Hungary and the Ottoman Empire formed the Central Empires, sometimes referred to as the Central Powers. These two blocs fought on several fronts, including the Western Front in France and Belgium, the Eastern Front in Russia, and several other fronts in Italy, the Balkans and the Middle East. The war was characterised by trench warfare, a military tactic where both sides fought from fortified trenches and where advances were often measured in metres despite massive casualties. The war also saw the use of new technologies and weapons, including heavy artillery, aircraft, tanks, submarines and poison gas. These innovations contributed to the massive loss of life and destruction of civilian infrastructure. The First World War ended on 11 November 1918 with the signing of the armistice. The consequences of the conflict were profound, with the redrawing of the map of Europe, the collapse of the central empires, the emergence of new states and the establishment of the Treaty of Versailles, which laid the foundations for the Second World War a few decades later.

The assassination of Archduke Franz Ferdinand on 28 June 1914 is often cited as the event that sparked off the First World War. However, it was not the assassination itself that caused the war, but rather the way in which different nations reacted to the event. Austria-Hungary, having been assured of German support, declared war on Serbia, accused of complicity in the assassination. Russia, which saw itself as the protector of the Slavic peoples, including the Serbs, began to mobilise its army in support of Serbia. Germany, as an ally of Austria-Hungary, declared war on Russia and subsequently on France, Russia's ally. When Germany invaded Belgium to attack France from the north, the violation of Belgian neutrality led the United Kingdom to declare war on Germany. Other countries were drawn into the conflict because of their respective alliances or their own imperialist interests, turning the war into a global conflict. The conflict lasted from 1914 to 1918, involving more than 30 nations and causing the deaths of millions of people. It radically transformed the political and social order of the world and laid the foundations for the tensions and conflicts that dominated the twentieth century.

The consequences of the First World War were profoundly destructive and transformed the world in an unprecedented way. The loss of life was enormous: around 10 million soldiers were killed and millions more were wounded. The number of civilians killed or injured as a direct result of the war is difficult to quantify, but is estimated to be in the millions. The Spanish flu epidemic of 1918, aggravated by the displacement of populations during the war, also caused the deaths of tens of millions of people around the world. Beyond the human losses, the economic and social costs of the war were enormous. European countries, in particular, saw their infrastructures destroyed and their economies ruined. War debts burdened economies for decades. Societies were also profoundly disrupted: millions of people were displaced, political regimes were overthrown and old social hierarchies were challenged. Politically, the war led to the end of the great European empires (Russian, German, Ottoman and Austro-Hungarian) and the creation of new nations, redrawing the map of Europe and the Middle East. In addition, the Treaty of Versailles, which officially ended the war in 1919, created tensions and resentments, particularly in Germany, which contributed to the rise of fascism and ultimately to the Second World War. Finally, the First World War also had profound cultural and psychological consequences. It called into question the ideals of progress and civilisation that had prevailed before the war, and led to a reconsideration of reason and morality.

Perhaps the most striking features of the First World War were trench warfare and the intensive use of new military technologies. Trench warfare was a defensive strategy in which both sides dug and occupied a complex network of trenches, hoping to protect their troops while blocking the enemy's advance. Living conditions in these trenches were atrocious: cold, rain, mud, vermin, disease, and the constant danger of enemy fire and artillery attacks. In addition, offensives to take control of enemy trenches were often disastrous, causing huge casualties for minimal territorial gains. The battles of the Somme and Verdun, among the deadliest in human history, are perfect examples of these disastrous offensives. The First World War also saw the use of new military technologies on an unprecedented scale. Artillery was improved, with the introduction of the fragmentation shell and the massive use of heavy artillery. Machine guns, tanks, military aircraft, submarines and even chemical weapons were used on a large scale for the first time. These technological innovations helped to increase the lethality of the conflict, but they also led to a war of attrition, with each side trying to exhaust the other through massive losses rather than decisive victories. Ultimately, the First World War revealed the true horror of modern industrial warfare, with its millions of dead, devastated landscapes and lasting psychological trauma.

The First World War had a major geopolitical impact, redrawing the map of Europe and the Middle East. The collapse of the central empires led to the creation of many new states. The Treaty of Versailles, which officially ended the war, imposed severe sanctions on Germany and redrawn the borders of Europe. The German Empire was dismantled, losing much of its territory to the victors. The Austro-Hungarian Empire was divided into several nation states, including Austria, Hungary, Czechoslovakia and Yugoslavia. The Ottoman Empire, defeated and occupied, was divided between the victorious powers with the Treaty of Sèvres in 1920, leading to the creation of new states in the Middle East, such as Iraq and Syria. However, the resistance led by Mustafa Kemal Atatürk in Turkey led to the Turkish War of Independence and the creation of the modern Republic of Turkey. In Russia, the collapse of the Eastern Front led to the Russian Revolution of 1917, which overthrew the Tsarist regime and established a Communist government, leading to the creation of the Soviet Union. These radical changes destabilised the political and social order in Europe and the Middle East. Tensions between the new states and unresolved grievances from the war contributed to the rise of authoritarian and fascist regimes, ultimately leading to the Second World War.

Escalating tensions: Preamble to the Conflict[modifier | modifier le wikicode]

The run-up to the First World War was marked by a series of international crises and local conflicts that exacerbated tensions between the major European powers and undermined the stability of the international system at the time. The first Moroccan crisis in 1905-1906 arose when Germany challenged France's ambitions in Morocco, causing international tension that was resolved by the Algeciras Conference. This conference resulted in an agreement that recognised Morocco as a free state but confirmed France's effective control over the country, which was seen as a defeat for Germany. Italy's invasion of Libya in 1911 marked an escalation in international tensions. Libya was then a province of the Ottoman Empire, and the Italian invasion triggered an international crisis because of the implications for the balance of power in the Mediterranean and the Middle East. The Balkan Wars of 1912-1913 further exacerbated tensions. They were triggered by a series of conflicts between several Balkan states (Serbia, Bulgaria, Greece and Montenegro) and the Ottoman Empire. These wars challenged the balance of power in the region and created a climate of mistrust and animosity, particularly between Serbia and Austria-Hungary. These crises not only exacerbated the rivalries between the great powers, but also highlighted the weaknesses of the alliance system of the time and the limits of diplomatic mechanisms for resolving conflicts. They helped to create a climate of tension and mistrust that eventually led to the outbreak of the First World War in 1914.

The twentieth century began with a series of international crises that exacerbated tensions between the great European powers. Colonial, economic and military rivalries led to an arms race and an increasing polarisation of international politics, with two major alliance blocs emerging. The Triple Alliance, formed by Germany, Austria-Hungary and Italy, and the Triple Entente, formed by France, the United Kingdom and Russia, were strengthened by the accession of other countries. Bulgaria, disappointed by the outcome of the Balkan wars, chose to ally itself with the Triple Alliance. On the other hand, Greece, which had benefited from these wars to expand its territory, drew closer to the Triple Entente. The complexity and interconnectedness of these alliances not only crystallised oppositions, but also created a climate of uncertainty and mistrust that ultimately led to the outbreak of the First World War. The alliances forced countries to support each other in the event of war, even if the reasons for the conflict were not always clear or directly linked to their interests. In addition, the arms race raised the stakes and created an atmosphere of tension and anticipation of inevitable war.

From Local Crisis to the Flame of European War[modifier | modifier le wikicode]

The Assassination of Archduke Franz Ferdinand: The Initial Fuse[modifier | modifier le wikicode]

The attack that took place in Sarajevo on 28 June 1914 is widely recognised as the catalyst that plunged the world into the First World War. On that day, Archduke Franz Ferdinand, the heir apparent to the Austro-Hungarian throne, was tragically killed in Sarajevo, the capital of Bosnia-Herzegovina, by Gavrilo Princip, a young Serb nationalist. Born on 25 July 1894 in Obljaj, then part of the Bosnian province of the Austro-Hungarian Empire and now in Bosnia-Herzegovina, Princip was a fervent supporter of Serbian nationalism. He is best known for the tragic assassination of Franz Ferdinand in Sarajevo. An active member of the "Black Hand", a clandestine organisation advocating the independence of Bosnia-Herzegovina and its integration into Serbia, Princip had undergone military training in Serbia before returning to Bosnia to orchestrate the attack. On the fateful day, 28 June 1914, Princip, along with several other members of the Black Hand, managed to approach Archduke Franz Ferdinand's car during his visit to Sarajevo. He then shot the Archduke and his wife, Sophie, with a pistol. This set off a chain reaction of alliances and reprisals that led to military escalation and, ultimately, the outbreak of the First World War. After the attack, Princip was arrested and imprisoned. Tried for his role in the assassination of the Archduke, he was sentenced to 20 years in prison. However, he did not have to serve the full sentence, dying in prison in 1918, aged just 23, of tuberculosis.

The Sarajevo bombing triggered a cascade of diplomatic and military reactions that led to war in Europe. After the assassination of Archduke Franz Ferdinand, Austria-Hungary pointed the finger at Serbia, accusing it of having orchestrated the crime, and demanded reparations. This accusation was not unfounded. Since the 1870s and 1880s, Serbia had been a thorn in the side of the Austro-Hungarian Empire. At that time, Serbia had embarked on a campaign to unify the Slavic peoples of the southern Balkans, a region that included populations under Austro-Hungarian rule. This unification movement was perceived by the Austro-Hungarian Empire as a direct threat to its territorial integrity and stability. Fear that their empire would disintegrate as a result of the rise of Slav nationalism prompted the Austro-Hungarian rulers to take retaliatory measures against Serbia after the assassination of the Archduke. This tension between the two nations was one of the main triggers for the escalation that led to the First World War.

The annexation of Bosnia-Herzegovina by Austria-Hungary in 1908 aggravated tensions with Serbia. This province, under Austro-Hungarian protectorate since the Congress of Berlin in 1878, was mainly populated by South Slavs, an ethnic group to which the Serbs also belonged. The Serbs aspired to the integration of these regions into a "Greater Serbia", an idea fuelled by the current of Panslavism. The official annexation of Bosnia-Herzegovina by Austria-Hungary was perceived by Serbia as a violation of their national ambitions. Moreover, the annexation was seen as a direct threat to Serbia, as it gave Austria-Hungary a common border with the kingdom. In response, Serbia increased its support for the nationalist movements active in the Austro-Hungarian regions populated by South Slavs, further exacerbating tensions with the Austro-Hungarian Empire. These growing tensions played a crucial role in the outbreak of the First World War.

The assassination of Archduke Franz Ferdinand in 1914 by Gavrilo Princip, a Serbian nationalist, set off a firestorm in an already tense Europe. Perceived by Austria-Hungary as a direct affront, this act triggered an ultimatum to Serbia, demanding reparations and guarantees. However, Serbia refused to comply fully with Austro-Hungarian demands, prompting Austria-Hungary's declaration of war on Serbia on 28 July 1914. The complex system of military alliances between the great European powers quickly transformed this regional conflict into a global conflagration. Germany, linked to Austria-Hungary by the Triple Alliance, declared war on Russia and France, Serbia's allies. Similarly, the Ottoman Empire and Bulgaria, with their own agreements with Germany and Austria-Hungary, went to war against the Allies - the United Kingdom, France, Russia, Italy, Japan and later the United States. Thus began the First World War, a large-scale conflict that reshaped the world as we know it.

The assassination of Archduke Franz Ferdinand was merely the spark that ignited a powder keg prepared by years of simmering tensions. The breeding ground for the First World War was much deeper and more complex, rooted in a series of interconnected factors. Nationalism, for example, was a major factor. In many parts of Europe, particularly the Balkans and parts of the Austro-Hungarian Empire, nationalist movements sought to create unified nation states for their peoples. This nationalism was sometimes accompanied by anti-imperialist sentiments and a desire for freedom from foreign domination. Imperialism also played a crucial role. The great European powers were engaged in a race for colonial expansion throughout the world, which exacerbated rivalries and tensions between them. Competition for resources, markets and prestige created a climate of mistrust and animosity. Finally, internal economic and political tensions also contributed to the march towards war. Rapid economic change exacerbated inequalities and social tensions in many countries, while rigid political structures often failed to respond to demands for reform. Although the assassination of Franz Ferdinand was the immediate catalyst for the war, its root causes were deeply rooted in the social, political and economic structures of the time.

The Western Front between 1915 and 1916 - atlas-historique.net

Chronology of the events of the First World War[modifier | modifier le wikicode]

The fateful act of 28 June 1914 in Sarajevo, when Archduke Franz Ferdinand of Austria-Hungary was assassinated, is widely recognised as the trigger for the First World War. This dramatic event triggered an international crisis with fatal consequences, exacerbating already existing tensions between the European powers and provoking a cascade of military and political alliances that ultimately plunged the world into global conflict. Gavrilo Princip, the young man who carried out the assassination, was a fervent Serbian nationalist. His convictions were so deep that he had forged links with the secret radical group known as the Black Hand. This terrorist group, whose aim was the liberation of the southern Slavs from Austro-Hungarian rule, was the catalyst that enabled Princip to carry out his destructive act.

The assassination of Archduke Franz Ferdinand led Austria-Hungary to issue a stern ultimatum to Serbia on 23 July 1914. This ultimatum demanded a thorough investigation into possible Serbian involvement in the assassination, as well as the cessation of all hostile activities against Austria-Hungary on Serbian soil.

Although Serbia agreed to the majority of these demands, it refused to comply with all of Austria-Hungary's requests. This led Austria-Hungary to declare war on Serbia on 28 July 1914, triggering a series of events that rapidly amplified existing tensions and activated the networks of alliances between the various powers, ultimately leading to the global outbreak of the First World War. Following Austria-Hungary's declaration of war on Serbia on 28 July 1914, alliances were formed and one country after another declared war on another. Germany declared war on Russia on 1 August 1914, then on France the following day, prompting the United Kingdom to enter the war in support of France. Many other countries subsequently joined the conflict, including Italy, Japan, the United States and the Ottoman Empire. By mid-August 1914, most of the major European powers were involved in the conflict.

After declaring war on France on 3 August 1914, Germany launched a rapid offensive through Belgium, aimed at neutralising France before potential reinforcements arrived. However, this lightning advance was halted by the resistance of French and British forces, culminating in the Battle of the Marne, which took place from 6 to 12 September 1914. This battle was one of the most significant confrontations of the First World War. It enabled the Allies to effectively repel the German forces and prevent the capture of Paris. However, contrary to initial expectations of a short war, the conflict became bogged down and lasted four more years, with a catastrophic human and material toll.

After the Battle of the Marne in September 1914, despite their desire to advance towards Germany, the French and British forces faced determined resistance from the German armies. The Germans succeeded in withdrawing and fortifying themselves in strategic defensive positions stretching from the North Sea through Belgium and France to the Swiss border. What followed was a "race to the sea", where each side tried to bypass the other from the west. However, this strategy eventually led to the construction of a network of trenches to consolidate and protect the positions acquired. This scenario marked the beginning of trench warfare, which lasted for several years, symbolising the stagnation and deadlock of the conflict on the Western Front.

In December 1914, the war's Western Front stretched from the English Channel to the German border, a 700-kilometre stretch through northern France and Belgium. Both belligerents entrenched themselves in impenetrable trench positions, turning the conflict into a series of static and deadly face-offs. Nevertheless, efforts were still being made to break the deadlock. Although massive offensives often resulted in huge losses without much territorial gain, the hope of a decisive breakthrough never completely faded. This fierce fighting on the Western Front continued until the end of the war in 1918.

From December 1914 until the end of the conflict in November 1918, the belligerents were mired in trench warfare. This type of warfare was characterised by networks of deep, fortified trenches protected by barbed wire and heavy weapons. These trenches, often only a few dozen metres apart, became the scene of incessant fighting. Much of the military activity consisted of assaults on enemy trenches, intensive artillery bombardment and carefully planned large-scale offensives, all with the aim of breaking through the enemy lines. These attempts often resulted in minimal gains of territory at the cost of considerable loss of life. This war of position, emblematic of the First World War, entailed colossal human and material costs on both sides. The trenches, symbols of this stalemate and of the futility of war, have left their mark on our memories and have gone down in history as testimony to the carnage of that era.

The trench warfare that raged on the Western Front between 1915 and 1918 during the First World War was marked by unprecedented brutality. Soldiers on both sides of the conflict were forced to live in appalling conditions, confined to cramped, unhealthy trenches, exposed to bad weather and disease, and under constant artillery fire. They were also subject to toxic gas attacks, air raids, machine-gun fire and bayonet assaults. The slaughter was immense: millions of lives, both military and civilian, were lost, and countless others were wounded, traumatised or displaced by the fighting. The war also left an indelible mark on the psyche of the survivors, with many soldiers suffering from war trauma, psychiatric disorders and eating disorders. The scale of the devastation, both physical and psychological, had a profound effect on the societies affected, leaving a lasting legacy of pain and loss. The horror and inhumanity of trench warfare became symbols of the futility and absurdity of war in general.

The Battle of Verdun and the Somme Offensive, which took place in 1916, were among the most devastating battles of the First World War. These battles are regarded as emblematic examples of the brutality and massive loss of life characteristic of trench warfare. The Battle of Verdun began on 21 February 1916 with a German offensive. The German forces hoped to exhaust the French army by forcing it to defend the fortified town of Verdun. The battle lasted until 18 December 1916, making it one of the longest in history. It was marked by fierce fighting, massive bombardments, the use of poison gas and enormous loss of life. It is estimated that there were around 800,000 casualties, many of whom died in terrible conditions. The Somme Offensive began on 1 July 1916, with the aim of relieving pressure on the French forces at Verdun and weakening the German army. British and French forces launched an offensive along a 40km front in northern France. The first day of the offensive was the deadliest in the history of the British Army, with around 57,000 casualties. The offensive, which lasted until November, claimed more than a million casualties on both sides. These battles have left a deep imprint on our collective memory because of their violence and the scale of the loss of life. They contributed to making 1916 one of the deadliest years of the First World War.

The Chemin des Dames Offensive, also known as the Second Battle of the Aisne, took place in April 1917. It was orchestrated by French General Robert Nivelle, who had promised a decisive victory over the Germans in 48 hours thanks to an innovative artillery strategy and rapid movement. However, the preparations for the offensive were well known and the German forces were well prepared to resist it. The offensive began on 16 April 1917 and was immediately met with strong resistance. The French soldiers came up against reinforced and well-prepared German defences, incessant machine-gun fire and unfavourable weather conditions. In addition, the French artillery was unable to effectively eliminate the German defences before the attack. Instead of the promised quick victory, the offensive turned into a costly stalemate that lasted until 9 May 1917, with few territorial gains to show for it and catastrophic casualties. French losses were estimated at around 187,000 men, and German losses at around 168,000. This devastating defeat had a significant impact on the morale of French troops, leading to large-scale mutinies in the French army. The political consequences of this failure were just as significant. Nivelle was quickly removed as commander-in-chief and replaced by General Philippe Pétain, who had to work hard to restore morale in the French army. This event marked a turning point in the way the war was fought by the French, with a shift to a more defensive and cautious strategy.

The entry of the United States into the war in April 1917 provided valuable support to the Allies. When the United States entered the war, it was an economically robust nation and had a large potential population of soldiers. Although their regular army was small and inexperienced, they were able to mobilise quickly and send large numbers of troops to Europe. The American contribution was essential in both material and human terms. Economically, the United States provided significant financial support to the Allies, enabling them to maintain their war effort. The United States also provided large quantities of supplies, equipment and munitions, which helped the Allies maintain their numerical superiority over the Axis forces. In human terms, the arrival of the American Expeditionary Forces (AEF), led by General John J. Pershing, strengthened the Allied forces on the Western Front. American troops took part in several major offensives in 1918, helping to turn the tide of the war. However, although America's entry into the war had a significant impact, it came relatively late in the conflict and was not the decisive factor in the Allied victory. Previous battles, fought mainly by French, British and Russian forces, had considerably weakened the central forces even before the Americans arrived on the front.

The final year of the First World War, 1918, saw a major shift in the balance of power. After years of trench warfare and attrition, the Allied forces were able to launch several successful offensives that finally forced Germany to capitulate. After signing the Treaty of Brest-Litovsk with Russia in March 1918, Germany launched a series of massive offensives on the Western Front, known as the Spring Offensives. However, although these offensives initially met with some success, they failed to break the Allied line decisively and cost Germany many precious lives. The Allied forces launched a series of counter-offensives, the most famous being the Second Battle of the Marne in July 1918. This battle marked the beginning of the end for German forces on the Western Front. Subsequently, the Allies launched the Hundred Days Offensive, a series of attacks that gradually pushed the German forces back from their positions. The Meuse-Argonne offensive, in which American forces played a significant part, was a key part of this campaign. Meanwhile, Germany was plagued by internal unrest, including strikes, mutinies and civil unrest, exacerbated by food shortages caused by the British naval blockade. Against this backdrop, Germany asked for an armistice, which was signed on 11 November 1918, putting an end to the fighting on the Western Front. This armistice marked the end of the First World War, although the final terms of the peace were not fixed until the Treaty of Versailles the following year.

11 November 1918 marked the official end of hostilities in the First World War. This day became known as Armistice Day and is commemorated every year in many countries. The armistice was signed in a train carriage in the forest of Compiègne in France. The terms of the armistice required, among other things, that the Germans evacuate the occupied territories, surrender a significant amount of artillery and other military equipment, and allow certain areas of Germany to be occupied by the Allies. After the armistice was signed, peace negotiations began in Paris. These negotiations culminated in the signing of the Treaty of Versailles in June 1919. This treaty placed the responsibility for the war on Germany and its allies and demanded from them considerable reparations, territorial concessions and disarmament. The harsh terms of the treaty were a source of controversy and resentment in Germany, contributing to the tensions that eventually led to the Second World War.

Russia, as a member of the Triple Entente with France and the UK, played an important role in the war. However, Russia faced many difficulties during the war. The defeat at the Battle of Tannenberg was a major setback for the Russian army and marked a turning point in the war on the Eastern Front. Over the next few years, Russia continued to struggle against the central forces, but was weakened by internal problems, including growing dissatisfaction with the war, economic mismanagement and political instability. These problems culminated in 1917 with the February and October Revolutions. The February Revolution overthrew Tsar Nicholas II and established a provisional government, while the October Revolution brought the Bolsheviks to power. After taking control, the Bolsheviks quickly began peace negotiations with Germany, which led to the signing of the Treaty of Brest-Litovsk in March 1918. This treaty officially ended Russia's participation in the First World War. However, Russia's exit from the war had major consequences for the Allies, as it allowed Germany to concentrate all its forces on the Western Front. However, this situation was eventually offset by the entry of the United States into the war in April 1917, which helped to redress the balance of power.

The Balkans were a theatre of particularly intense confrontation during the First World War. Romania, with a majority of its population of Latin language and culture, joined the Triple Entente, composed mainly of France, the United Kingdom and Russia, in the hope of recovering Romanian-populated territories that were then under the control of the Austro-Hungarian Empire. However, the Romanian offensive was halted by the forces of the Central Empires (Germany, Austria-Hungary and their allies) and Romania was occupied until the end of 1918, when the collapse of the Central Empires allowed Romania to recover and even expand its territory. Serbia, meanwhile, was a key player in the outbreak of war with the assassination of Archduke Franz Ferdinand of Austria in Sarajevo in June 1914. Serbia resisted the Austrian offensives in 1914, but was invaded and occupied in 1915 by the forces of the Central Empires. However, with the help of French and British forces who had landed at Salonika in Greece, Serbia managed to regain control of its territory during the Allied counter-offensive in 1918, contributing to the collapse of Austria-Hungary and the eventual Allied victory. It is also important to note the role played by other Balkan nations during the war. Bulgaria, for example, aligned itself with the Central Empires, hoping to recover the territories lost in previous Balkan wars, but was ultimately defeated and suffered significant territorial losses in the Treaty of Neuilly-sur-Seine in 1919. Similarly, Greece, after a period of neutrality and internal tensions, joined the Allies in 1917 and played an important role in the Balkan operations.

Russia has historically had ambitions to expand southwards, in particular to secure year-round access to ice-free water. The Bosphorus and Dardanelles Straits, which link the Black Sea to the Mediterranean, were of major strategic importance to Russia as they were the only sea passage for Russian ships from the Black Sea to the rest of the world. In addition, Russia presented itself as the protector of the Slavs and Orthodox Christians in the Balkans, which led to tensions with the Ottoman Empire, which controlled a large part of the region. This played a part in Russia's involvement in the First World War alongside Serbia and other Slavic countries in the Balkans. The war against the Ottoman Empire proved difficult for Russia. The war effort was complicated by internal problems, including social and political tensions that eventually led to the Russian Revolution and the collapse of the Tsarist regime. After the revolution, the new Communist government sought to end the war. Under the Treaty of Brest-Litovsk in 1918, Russia renounced its claims to the straits in exchange for an end to hostilities with the Central Powers, which included the Ottoman Empire.

Fronts of the First World War.

The Globalisation of Conflict: International Actors[modifier | modifier le wikicode]

The First World War was a world war in the sense that it involved nations from all over the world. The European colonial empires played an important role in the conflict, providing troops, resources and sometimes additional theatres of war. The First World War was a global conflict, involving nations from all over the world. The European colonial empires played an important role in the conflict, mobilising their colonies to provide troops and resources, and sometimes even serving as additional theatres of war. The British Empire mobilised many countries for the conflict. Nations such as India, Canada, Australia, New Zealand and South Africa sent troops to fight alongside the British. In particular, India provided almost 1.5 million soldiers who served in Europe, Africa and the Middle East. Similarly, France mobilised troops from its colonies, with soldiers coming from regions such as Algeria, Morocco, Tunisia, sub-Saharan Africa and Indochina. Germany used its colonies mainly for their resources. However, in some cases, fighting did take place in these regions. In East Africa, for example, German General Paul von Lettow-Vorbeck led an effective guerrilla campaign against British forces. The contributions of these colonies had a significant impact, not only on the overall war effort, but also on relations between the colonial nations and their colonies. After the war, many of the promises of reform or independence made to the colonies were not fulfilled, leading to increased tensions and independence movements across the colonial world.

The First World War had a major impact on colonial territories, bringing about profound political, economic and social changes. The fighting was often carried out by colonial troops recruited by the European powers, and many territories were affected by the war. In Africa, there were clashes between French, British, Belgian and German colonial forces for control of the German territories in East Africa. This led to population displacements, economic disruption and increased exploitation of natural resources. In Asia, tensions also increased, particularly in the German colonies in China and the Pacific, which were taken over by the Japanese. Nationalist movements in India were galvanised by the war, leading to increased demands for autonomy and independence. In the Pacific, German New Guinea was taken by Australia, while New Zealand took control of German Samoa. These conflicts paved the way for new colonial arrangements after the war. The First World War therefore not only affected European nations, but also had a lasting impact on their colonies and shaped the political and social development of these regions.

The First World War profoundly disrupted the global economy. The entire global trading system was disrupted, trade between countries was reduced and the supply of essential resources was disrupted. Countries at war had to reorient their economies to support the war effort. This meant a massive increase in military production, but also a reduction in the production of consumer goods, leading to shortages and inflation. Neutral countries were also affected, as their traditional trade routes were disrupted and they had to look for new trading partners. The war also exacerbated economic and social inequalities, both between and within countries. The rich became richer as a result of the war, while the poor became poorer, leading to social and political tensions. Ultimately, the First World War undermined the existing world economic order and paved the way for subsequent economic and political crises, notably the Great Depression of the 1930s. The war dramatically demonstrated the extent to which the world's economies were interconnected and dependent on each other, and underlined the need for international cooperation and coordination to maintain global economic stability.

The world and the first world conflict - atlas-historique.net

The First World War was a total conflict, marked by the mobilisation of all national resources - human, economic and technological - to wage war. It was not only the armies that were involved in the conflict: civilians were also greatly affected by the war, through the bombardments, the deprivations caused by the blockade and the mass conscription of the male population.

In military terms, the war was marked by technological innovation, with the introduction of new weapons such as tanks, aircraft, submarines and poison gas. However, military strategy has often been marked by an outdated vision of war, with massive offensives costing human lives, and little room for manoeuvre or exploitation of new technologies.

Economic warfare was also a crucial factor in the conflict. The naval blockade imposed by the Royal Navy contributed in particular to weakening the German economy and causing food shortages in Germany. For their part, the Allies benefited from the economic support of the United States, which lent large amounts of money and provided resources and war material.

Finally, the war was accompanied by intense ideological propaganda. Each side sought to mobilise the nationalist sentiments of its population, dehumanise the enemy and justify the sacrifices necessary for victory. Concepts such as the "war for civilisation" or the "war for democracy" were widely used to give meaning to the war and to mobilise the population. However, these ideologies also helped to exacerbate national tensions and prepare the ground for subsequent conflicts.

The Colonies of the European Powers[modifier | modifier le wikicode]

The First World War also had major consequences in the colonies of the European powers. The German colonies, particularly in Africa, were the scene of fighting between the forces of the various colonial empires. British and French troops conquered the German colonies and seized their wealth, including plantations, mines and natural resources. The colonies were also called upon to contribute to the war effort, with colonial troops sent to fight on the European fronts. Several hundred thousand African, Asian and American soldiers were mobilised, often in very difficult conditions. The colonies also provided essential resources and raw materials for the war effort, such as rubber, palm oil and cotton. This led to increased exploitation of the colonies and worsening working conditions for the local populations.

The role of the United States[modifier | modifier le wikicode]

America's entry into the First World War sparked a national debate. On the one hand, the interventionists, who included politicians, intellectuals and journalists, argued that the United States had a moral responsibility to defend democratic values and support its allies in Europe, principally the United Kingdom and France. They were convinced that America could not remain aloof from the conflict that was redefining the global political landscape. Isolationists, on the other hand, advocated non-engagement. Many came from rural, remote areas of the Midwest and West, and were primarily concerned with domestic issues. They feared that involvement in the European conflict would damage the American economy and lead to higher taxes and possible conscription. They argued that the US should concentrate on solving its own problems and avoid getting involved in foreign conflicts. Ultimately, several factors led to the decision to enter the war in 1917, including Germany's indefinite submarine warfare which resulted in the deaths of American citizens, and the Zimmerman telegram which revealed a German proposal for Mexico to enter the war against the United States.

Several events precipitated the United States' entry into the First World War in 1917, despite intense public debate. Firstly, the attack on the Lusitania, a British liner, by a German submarine in 1915 provoked strong indignation in the United States. The incident, which resulted in the deaths of 128 Americans, was widely condemned and helped to strengthen anti-German sentiment in the United States. The discovery of the Zimmermann telegram in 1917 also played a key role. This telegram, sent by the German foreign minister to his ambassador in Mexico, proposed a military alliance between Germany and Mexico, should the United States enter the war. This revelation aroused indignation among the American population and increased pressure for the United States to enter the war. Finally, the United States' entry into the war was seen by some as an opportunity to strengthen the country's international position and promote democratic values throughout the world. This decision marked the beginning of an era in which the United States would become increasingly involved in world affairs.

Zimmermann-telegramm-offen.jpg

The sinking of the Lusitania had a profound impact on American public opinion and helped to change American attitudes to the war. The tragedy occurred in the context of total German submarine warfare, which sought to weaken the Allies by cutting off their supply lines. The Germans had warned that all ships sailing to Britain would be considered targets, but the sinking of the Lusitania, with its heavy loss of civilian life, was seen as an inexcusable act of aggression. The event was widely reported in the American media, which presented the sinking as an act of German barbarism. It caused a public outcry and fuelled anti-German sentiment in the United States. Although the US did not enter the war immediately after the sinking of the Lusitania, the incident was a turning point that helped pave the way for the US entry into the war two years later.

The torpedoing of the Lusitania sparked outrage in the United States and put President Wilson in a difficult position. Although he had been re-elected in 1916 on the slogan "He kept us out of war", the situation was rapidly changing. After the sinking of the Lusitania, President Wilson sent several notes to Germany, demanding reparations and an end to unrestricted submarine warfare. However, US patience ran out after Germany resumed its unrestricted attacks on ships in 1917. The event helped sway public opinion in favour of intervention, and when Germany tried to incite Mexico to go to war against the US (as revealed in the Zimmermann Telegram), it was the last straw. In April 1917, President Wilson asked Congress to declare war on Germany, marking the United States' entry into the First World War.

Germany's resumption of unrestricted submarine warfare in 1917 marked a turning point in the United States' involvement in the First World War. This German policy angered the United States, which had maintained a position of neutrality since the start of the war in 1914. Unrestricted submarine warfare threatened vital Allied supplies, and by sinking neutral ships, Germany pushed the United States out of its neutrality. Germany hoped that this strategy would lead to victory before the United States could mobilise its army and navy for active combat. However, this strategy backfired. The United States made a significant contribution to the Allied war effort, both militarily and economically. Its human and material resources helped tip the balance in favour of the Allies on the Western Front, while its financial support helped maintain the Allies' fighting capacity. Ultimately, America's entry into the war played a key role in Germany's defeat and the end of the First World War in November 1918.

The Zimmerman telegram is a striking example of how espionage and cryptography played an important role during the First World War. It also helped galvanise American public support for going to war against Germany. The telegram was intercepted by British intelligence thanks to their decryption efforts. The British realised the importance of this information and realised that it could be used to influence American public opinion in favour of going to war. However, they had to be careful about how they revealed the information to the Americans, as they did not want the Germans to know that they were able to decode their encrypted messages. Once the United States had been informed, President Woodrow Wilson took the decision to make the telegram public, despite the potential risks to British intelligence capabilities. The revelation of the telegram caused an uproar in the United States and added to the public and political pressure for the country to go to war. Ultimately, the Zimmerman telegram was one of the factors that led to the United States' entry into the First World War in April 1917.

Japan's involvement[modifier | modifier le wikicode]

When the First World War broke out in 1914, Japan, which had formed an alliance with the United Kingdom in 1902, declared war on Germany. This gave Japan an excuse to extend its influence in Asia and the Pacific, particularly in areas that had been under German control before the war. Japan quickly occupied German island possessions in the Pacific, including the Carolines, Marshall Islands and Marianas. In mainland Asia, Japan seized control of the German concession at Qingdao, China. In addition, Japan took the opportunity to increase its influence over China. In January 1915, it presented China with the "Twenty-One Demands", which sought to establish quasi-colonial Japanese rule over China. Although China rejected some of the more extreme demands, it had to accept enough of them to significantly increase Japan's political and economic influence in China. After the war, despite some objections, Japan was able to retain most of its territorial gains at the Versailles peace conference in 1919, although this would be a source of tension with the United States and other nations in the years to come.

As well as expanding into Asia and the Pacific, Japan also played a significant role in supporting the Allied maritime efforts during the First World War. Japan, under its alliance with the United Kingdom, sent a fleet of destroyers to help protect and patrol the Pacific and Indian Oceans against German shipping. Japanese naval forces escorted Allied troop convoys, protected vital commercial shipping lanes, and actively sought out German surface raiders and submarines that threatened Allied shipping. These actions made a significant contribution to the Allied war effort in East and South-East Asian waters. Japan saw its participation in the First World War as an opportunity to improve its international position and its status as a great power. However, despite its contributions, Japan was frustrated by the treatment it received in the post-war peace settlement, fuelling nationalist and militarist sentiments that had significant repercussions in the decades that followed.

Japan's participation in the First World War played a significant role in establishing the country as a world power. By taking advantage of the opportunity to extend its influence in Asia and the Pacific, Japan succeeded in strengthening its power and influence on the international stage. The victory of Japan and the Allies in the First World War also enabled Japan to acquire several former German colonies in the Pacific, under the Treaty of Versailles. In addition, Japan was able to increase its economic and political influence in China, taking advantage of the chaos caused by the war and the revolutions underway in the country. However, despite these gains, Japan was dissatisfied with its treatment in the post-First World War world order, feeling that it had not received the recognition and respect it deserved as a world power. This feeling of dissatisfaction fuelled nationalist and militarist sentiments in Japan, contributing to the escalation of tensions in the following decades leading up to the Second World War.

The commitment of the Ottoman Empire[modifier | modifier le wikicode]

The Ottoman Empire played a decisive role in the First World War. It sided with the Central Powers (Germany and Austria-Hungary), provoking conflicts on several fronts, including Mesopotamia, Palestine and the Caucasus. In Mesopotamia, the Ottomans faced a British offensive aimed at securing the region's oil fields and protecting important communication routes to India. Despite fierce resistance, the Ottoman forces were finally defeated by the British in the Battle of Baghdad in 1917. In Palestine, the Ottoman Empire fought against British and French forces. The fighting was particularly intense in this region because of its strategic value, with Jerusalem as its main target. The Allied forces, led by British General Edmund Allenby, finally achieved a significant victory with the capture of Jerusalem in December 1917. In the Caucasus, the Ottomans fought against the Russians in a series of conflicts known as the Caucasus Campaign. The fighting in this region was motivated by Russia's desire to control the strategic Bosphorus and Dardanelles straits, and the Ottoman Empire's desire to suppress Armenian nationalist movements. The Ottoman Empire's involvement in the First World War had significant consequences, ultimately leading to the dissolution of the Empire at the end of the war and the establishment of the Republic of Turkey.

Control of the Dardanelles was of major strategic importance during the First World War. The Dardanelles is a narrow strait linking the Aegean Sea to the Sea of Marmara, and by extension, via the Bosphorus Strait, the Black Sea. Access to the Black Sea was essential for Russia, an ally of the Triple Entente (France, the United Kingdom and Russia), as it was one of its main export routes for grain and import route for munitions of war. In 1915, the Allies launched the Dardanelles campaign, or Gallipoli campaign, with the aim of taking control of the straits, opening up a supply route to Russia and forcing the Ottoman Empire out of the war. However, the offensive failed in the face of tenacious and well-organised Ottoman resistance. The battle was a disaster for the Allies, with heavy losses and no significant advances. At the same time, the policies of the Young Turks, the ruling party of the Ottoman Empire, led to the Armenian genocide of 1915-1917. More than a million Armenians were systematically killed or displaced in what is generally regarded as the first genocide of the 20th century. This policy also targeted other Christian minorities in the Ottoman Empire, notably the Assyrians and Pontic Greeks.

At the end of the First World War, the Ottoman Empire, which had fought alongside the Central Powers (Germany, Austria-Hungary and Bulgaria), was defeated. The Empire was occupied by Allied forces, mainly Britain and France, with specific areas under Italian and Greek control. This marked the beginning of the end of the Ottoman Empire, which had existed for around 600 years. The defeat and occupation led to many political and social changes, the most significant of which was the emergence of modern Turkey under the leadership of Mustafa Kemal Atatürk. The Treaty of Sèvres, signed in 1920, provided for the partition of the Ottoman Empire and the establishment of several nation states. However, many of the treaty's provisions were hotly contested in Turkey and led to the Turkish War of Independence led by Mustafa Kemal Atatürk and his supporters. This war eventually led to the abolition of the Sultanate and the founding of the Republic of Turkey in 1923. The Turkish War of Independence also led to the abrogation of the Treaty of Sèvres and its replacement by the Treaty of Lausanne in 1923, which established Turkey's modern borders and confirmed its independence.

South America in Conflict[modifier | modifier le wikicode]

Although South America was geographically distant from the main theatre of war in Europe, it was involved in the First World War in a variety of ways. Most South American countries remained neutral for most of the war, but supported the Allied war effort by providing raw materials, food and other resources.

Most South American countries, with the exception of Brazil, officially maintained their neutrality during the First World War. However, this did not prevent several of them from de facto supporting the Allies by providing raw materials, food and other resources. Brazil, in particular, declared war on Germany in 1917 after Brazilian merchant ships were torpedoed by German submarines. Brazil was the only South American country to send troops to Europe, although its military involvement was relatively limited. In addition to its military contribution, Brazil also played a key role in supplying vital resources, including rubber, coffee and meat, to the Allies. Argentina, Chile, Uruguay and Peru, although officially neutral, also supported the Allies by providing resources and allowing Allied ships to use their ports. On the other hand, countries such as Paraguay and Ecuador maintained strict neutrality throughout the war.

For the countries of South America, the First World War represented an opportunity to assert their independence and influence on the international stage. By supplying raw materials and other resources to the Allies, these countries were able to strengthen their economic and political ties with the great European powers. This enabled these countries to improve their economies, gain international recognition and establish themselves as important players in world affairs. Brazil, for example, became a founding member of the League of Nations (the predecessor of the UN) after the war, marking its rise as a regional power. As a result, participation in the war, albeit indirectly, gave these South American countries greater prestige and influence, and laid the foundations for their role in world affairs over the next century.

The participation of Brazil and certain other South American countries in the First World War enabled them to play an active role in the reconfiguration of the world order that followed. The Paris Peace Conference in 1919, which led to the signing of the Treaty of Versailles, was a crucial moment in this redefinition. Although the vast majority of decisions were taken by the major powers, the presence of these countries enabled them to take part in the discussions and present their perspectives. Their admission to the League of Nations was another important step. As members of this organisation, they had the opportunity to express their opinions on international issues and contribute to efforts to maintain world peace. In the end, although their influence was limited compared to that of the Great Powers, their involvement in the war and their participation in these organisations helped to strengthen their status and role on the international stage.

The Mobilisation of the Colonial Empires[modifier | modifier le wikicode]

The war effort of the First World War required a total mobilisation of the resources of each participating empire, which included not only the mobilisation of their material resources, but also of their population, including those of the colonies. The colonial empires, particularly the British and the French, mobilised their colonies exhaustively. Hundreds of thousands of colonial soldiers were recruited to fight on the European fronts, notably from India, West Africa and the Maghreb for Britain and France respectively. These soldiers played a crucial role in the war effort, fighting and dying in the trenches alongside their fellow Europeans. In addition, the colonies also provided valuable labour behind the front, working in armaments factories, shipyards, mines and agricultural fields to support the war economy. This was particularly true of the British dominion colonies, such as Canada, Australia and New Zealand, which not only sent troops but also supported the war effort with their industrial and agricultural production. The colonial empires played a crucial role in the First World War, contributing significantly to the overall war effort and playing a key role in the outcome of the conflict.

The colonies were used intensively for their production of raw materials, which were essential to the war effort. Minerals and precious metals, such as iron, copper and gold, were extracted in large quantities in the African, Asian and Oceanic colonies for use in the manufacture of arms and munitions. Similarly, rubber and palm oil, produced mainly in the colonies of South-East Asia and Africa, were indispensable to the war industry, used respectively in the production of tyres and lubricants. The colonies also contributed to the war effort by increasing their industrial production. Factories were created or converted for the production of military goods, while colonial workers were recruited in large numbers to work in these industries. This industrial mobilisation not only supported the war effort, but also brought about lasting social and economic changes in the colonies, promoting urbanisation and industrialisation. In addition, the colonies were also used as logistical and military bases, particularly those located on important shipping and communication routes. Colonial ports were used to supply warships, while air bases and communications facilities were built to support military operations. The contribution of the colonies to the war effort was multifaceted and essential to the outcome of the conflict.

Although the colonies played a crucial role in supporting the war effort of the colonial empires, the consequences for the colonial populations were often devastating. Working conditions in mines and factories were often harsh and dangerous, and many colonial workers were forced to work against their will, in what can be considered forced labour. In addition, the war effort led to shortages of food and other essential goods in many colonies, which had a significant impact on the daily lives of colonial populations. Restrictions on freedom of movement and severe control measures were also sources of resentment and dissatisfaction. In addition, the mobilisation of colonial troops and their participation in the war helped to raise aspirations for independence and national liberation. Colonial soldiers who had fought alongside European troops were often exposed to ideas of freedom and equality, and returned to their colonies with a heightened awareness of the injustice of colonial rule. These ideas were one of the catalysts for the decolonisation movements that emerged after the end of the war. In this way, although the colonial empires sought to exploit their colonies to support the war effort, they also sowed the seeds of their own decline.

The First World War was a major turning point in world history, with repercussions far beyond the battlefields of Europe. The war led to the mobilisation of populations and resources on a global scale, including in the colonial empires. This had a profound impact on colonial societies, often at great human and economic cost. For neutral countries, the war disrupted world trade and created shortages of raw materials, with significant economic effects. These countries had to navigate a world at war, balancing the needs of their own economies with the pressure to take sides in the conflict. Politically, the war transformed the map of Europe and the world. New states emerged from the empires that collapsed at the end of the war, notably the Ottoman Empire, the Austro-Hungarian Empire and the Russian Empire. Countries such as Czechoslovakia, Yugoslavia and Poland emerged, redrawing the borders of Europe. Finally, the ideals of democracy and self-determination promoted during the war fuelled nationalist and anti-colonial aspirations across the world. The war also led to the creation of the League of Nations, an attempt (albeit ultimately unsuccessful) to establish an international system to prevent future conflict. The First World War was a truly global conflict, with repercussions that have reshaped the world we live in today.

Final Reflections: Europe at the Centre of the World, from the End of the 19th Century to 1918[modifier | modifier le wikicode]

This period, often referred to as the "Age of Empires", was marked by European expansion and imperialism throughout the world. European empires, including the United Kingdom, France, Germany, Spain, Portugal, the Netherlands, Italy and Belgium, extended their influence to territories in Asia, Africa, the Americas and the Pacific. They sought to control these regions for their natural resources, markets and workforce, and often imposed their culture, language and political system on the local populations. In Europe itself, the political system was dominated by a complex web of alliances and rivalries between the great powers, which ultimately led to the outbreak of the First World War. Economically, Europe was the centre of world trade, with emerging industrial empires like Germany and established trading empires like the UK. Culturally, Europe also exerted a significant influence. European language, literature, philosophy, music and art had a global impact. Ideals such as liberalism, socialism, nationalism and Darwinism were widely disseminated and debated both in Europe and beyond. This period was also marked by resistance and protest. Anti-colonial movements began to emerge in many colonies, and social and political tensions in Europe led to major upheavals, including the Russian Revolution and the First World War. These events ultimately contributed to the end of the era of European domination and paved the way for the emergence of new world powers in the twentieth century.

The First World War profoundly altered the world's political, economic and social landscape. Politically, the war led to the fall of several empires, including the Russian, German, Ottoman and Austro-Hungarian empires. At the same time, it gave rise to many new nation states in Eastern Europe and the Middle East. It also marked the emergence of the United States as a global superpower, changing the international balance of power. Economically, the war caused enormous material losses and disrupted world trade. The financial costs of war led to high inflation and debt in many countries, which sowed the seeds of the Great Depression of the 1930s. Socially, the war caused the deaths of millions of people and left many more injured or traumatised. It also changed the role of women in society, many of whom had to take on traditionally male jobs while the men were at war. The war also stimulated colonial liberation and nationalist movements around the world. The Allies' promise of a "peace based on the right of peoples to self-determination" awakened aspirations for independence in many colonies. Finally, dissatisfaction with the terms of the Treaty of Versailles, which ended the war, contributed to the emergence of radical and totalitarian movements, notably Fascism in Italy and Nazism in Germany, which eventually led to the Second World War.

At the end of the First World War, the League of Nations was created with the aim of maintaining world peace and preventing future conflicts. This was one of the main points of US President Woodrow Wilson's "Fourteen Points" programme, which was presented as a plan for peace after the war. The League of Nations was the first international body of its kind, and it provided a forum for the peaceful resolution of conflicts. However, it faced many challenges and limitations, not least the fact that the United States never joined the organisation despite Wilson's involvement in its creation. Despite its ambitions, the League of Nations was unable to prevent aggression by fascist powers in the 1930s, and was eventually dissolved during the Second World War. The rise of Nazism in Germany was directly linked to the consequences of the First World War. The terms of peace laid down in the Treaty of Versailles were harsh on Germany, which was held responsible for starting the war and forced to pay crushing reparations. These conditions, combined with the economic crisis that followed, helped to create a sense of resentment and despair in Germany, creating fertile ground for the extremism and nationalism that led to the rise of the Nazi party.

The First World War, in particular, marked the end of the golden age of European imperialism and reshaped the political and economic map of the world. Many empires, such as the Russian Empire, the German Empire, the Austro-Hungarian Empire and the Ottoman Empire, collapsed as a result of the war. At the same time, new countries were created and new forces, such as the United States and Japan, began to assert their power on the world stage. The war also left a heavy legacy of trauma, loss and disillusionment, which has affected generations of people around the world. In addition, the harsh conditions imposed on Germany by the Treaty of Versailles contributed to the rise of extremism and the outbreak of the Second World War a few decades later. Ultimately, the impact of this period on world history was monumental, and its consequences are still felt today.

The First World War marked a major turning point in world history, triggering a series of transformations that reorganised the political map of the world. The European empires, which had dominated the world for centuries, were profoundly weakened by the war. The German, Austro-Hungarian, Russian and Ottoman empires collapsed, and new states were created in their former territories. The British and French empires survived the war, but were weakened and faced many challenges, including unrest in their colonies and economic crises at home. At the same time, the war marked the emergence of new powers on the world stage. The United States, which had remained largely isolated from European affairs before the war, became an economic and military superpower. The American economy was boosted by the demand for industrial and agricultural products during the war, while victory reinforced the prestige and international influence of the United States. Similarly, Russia, which underwent a revolution in 1917 and became the Soviet Union, began to play a major role in world politics. Despite the Soviet Union's initial isolation, the country went on to become a global superpower over the course of the twentieth century. The war also accelerated Japan's rise as a major power in Asia and the Pacific. By taking advantage of the war to extend its influence, Japan laid the foundations for its imperialist expansion in the following decades.

The economic consequences of the First World War were major and led to a significant realignment of world economic power. Before the war, European countries, in particular the United Kingdom and Germany, were world leaders in industry and trade. However, the immense damage caused by the war, as well as the burden of war debts, considerably weakened the European economies. On the other hand, the United States, which was relatively isolated from direct conflict until 1917, was able to prosper by supplying goods and loans to the belligerent nations. After the war, with its powerful industry and flourishing economy, the United States became the world's leading economic power. At the same time, the First World War planted the seeds for future conflicts, in particular the Second World War. The Treaty of Versailles, which ended the First World War, imposed heavy reparations on Germany and controversially redrawn the map of Europe. These conditions sowed discontent and resentment in Germany and elsewhere, creating fertile ground for extremist movements such as Nazism and ultimately leading to the Second World War. As a result, the First World War not only redefined the global political order, but also brought about a major economic realignment and laid the foundations for future conflicts.

The First World War marked a key transition in world history. Europe, which had long dominated the world stage politically, economically and culturally, saw its influence reduced as a result of the war. Enormous human and material losses, the economic burden of reconstruction and war debts, and internal political tensions weakened the European powers. Meanwhile, new powers began to emerge on the world stage. The United States, in particular, saw its influence grow after the First World War. Because of its late intervention in the war, it suffered far fewer losses than the European powers, and its economy became one of the strongest in the world. In addition, the Soviet Union, born of the Russian Revolution of 1917, emerged as a new superpower with an ideology that challenged the existing world order. The end of the war also saw the dismantling of the great empires in Europe, such as the Russian Empire, the Austro-Hungarian Empire and the Ottoman Empire, and the creation of new national states in Eastern Europe and the Middle East. These changes redefined the global balance of power and led to new tensions and conflicts, laying the foundations for the Second World War. The First World War was therefore a major turning point in world history, overturning the existing world order and shaping the world as we know it today.

Annexes[modifier | modifier le wikicode]

References[modifier | modifier le wikicode]