American colonial rule refers to the period during which the United States exerted political, economic, and military control over territories acquired after the Spanish-American War in 1898. This rule marked a significant shift in U.S. foreign policy, transforming the nation from a continental power to an overseas imperial power, influencing its relationships with newly acquired territories such as Puerto Rico, Guam, and the Philippines. The implications of this shift included debates over governance, citizenship, and the role of American values in shaping the future of these territories.