Summary and Keywords
U.S. imperialism took a variety of forms in the early 20th century, ranging from colonies in Puerto Rico and the Philippines to protectorates in Cuba, Panama, and other countries in Latin America, and open door policies such as that in China. Formal colonies would be ruled with U.S.-appointed colonial governors and supported by U.S. troops. Protectorates and open door policies promoted business expansion overseas through American oversight of foreign governments and, in the case of threats to economic and strategic interests, the deployment of U.S. marines. In all of these imperial forms, U.S. empire-building both reflected and shaped complex social, cultural, and political histories with ramifications for both foreign nations and America itself.
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