The United States originally declared the Western Hemisphere to be an American sphere of influence under which of the following policies?

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The Monroe Doctrine, introduced in 1823 by President James Monroe, declared that the Western Hemisphere, including Latin America, was no longer open to colonization by European powers and any interference by those powers would be seen as a threat to the security of the United States. This policy established the United States as a dominant power in the Western Hemisphere and set the stage for American imperialism in the region. Manifest Destiny was a 19th-century expansionist ideology that drove U.S. territorial expansion to the Pacific, and the Dayton Accords were a peace agreement signed in 1995 to end the war in Bosnia and Herzegovina. The Truman Doctrine was a Cold War policy aimed at containing the spread of communism.

The United States Originally Declared the Western Hemisphere to Be