The conquest of the territory
U. S. Expansionism: General Aspects
General considerations
Initially, before the creation of the United States, there were thirteen colonies opposed to Great Britain, but which had little in common. These colonies have different histories until they get together. Initially their cement was opposition to the metropolis, common points, common history and common identity was forged in opposition to Britain's and in the conquest of the rest of the territory.
As soon as the war of independence ends, the territory of the Thirteen colonies will expand. In 1783 the United States was created. In 1787 a federal state was created. It is a fundamental moment, the Thirteen States decide to unite to create a supranational power.
In other words, in American history we have first of all the territorial entities, the federal structures intervene in a second phase.