The Monroe Doctrine was a foreign policy statement issued by U.S. President James Monroe in 1823. It asserted that any further colonization or intervention by European powers in the Americas would be seen as acts of aggression against the United States, and the U.S. would view such actions as a threat to its own security and interests. The doctrine stated that the Western Hemisphere was closed for further colonization, and any attempt by European powers to interfere in the region would be deemed unacceptable. The Monroe Doctrine became a significant tenet of U.S. foreign policy, asserting America's role as the dominant power in the Western Hemisphere and signaling a shift towards isolationism.
