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Overseas expansion of the United States

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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. The overseas expansion of the United States into Puerto Rico and the Pacific occurred as a consequence of the Guano Islands Act, Spanish American War, the acquisition of American Samoa via the Treaty of Berlin, and the annexation of the Republic of Hawaii at the request of the then president of Hawaii, Sanford Dole. The U.S. Virgin Islands were purchased from Denmark in 1917. Only the Trust Territory of the Pacific Islands (including the Northern Mariana Islands) was gained after WWII.

In the period between the mid-1800s until the beginning of the twentieth century the United States gained a number of overseas islands and territories. The following areas have at one time or another been under the control of the United States of America and have not been fully incorporated into the country as states

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