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High Quality Content by WIKIPEDIA articles! 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 World War I, when all the major powers rapidly expanded their overseas territories. The area that would become Alaska was purchased from the Russian Empire in 1867, as a vital refueling station for ships trading with Asia. The overseas expansion of the United States into Puerto Rico and the Pacific occurred as a consequence of the Guano Islands Act, the Treaty of Paris which ended the 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.