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American Imperialism The United States became an imperialist nation at the end of the 19th century because Americans wanted to expand over seas with their belief in manifest destiny. The three factors that started American imperialism were political and military competition including the creation of a strong naval force, economic competition among industrial nations and a belief in the racial and cultural superiority of people of Anglo-Saxon decent. The Spanish American War marked the emergence of the United States as a world power. This brief war lasted less than four months from April 25 to August 12, 1898. A number of factors contributed t