Introduction to the age of empire (article) | Khan Academy
https://www.khanacademy.org/humanities/us-history/rise-to-world-power/age-of-empire/a/intro-to-age-of-empire
WebOverview. In the late nineteenth century, the United States abandoned its century-long commitment to isolationism and became an imperial power. After the Spanish-American War, the United States exercised significant control over Cuba, annexed Hawaii, and claimed Guam, Puerto Rico, and the Philippines as territories.
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