Overseas expansion of the United States references on wikipedia
Overseas_expansion_of_the_United_States United States overseas expansion follows the expansion of U.S. frontiers on the North American continent (see Mexican-American War, War of 1812, and Territorial acquisitions of the United States), in particular during the "Age of Imperialism", the later part of the nineteenth century and ending with WWI, when all the major powers rapidly expanded their overseas territories.