The Monroe Doctrine was a policy introduced by President James Monroe in 1823 that stated that any effort by European powers to colonize or interfere with states in North or South America would be viewed as acts of aggression. It essentially asserted that the United States would not tolerate any further colonization or European political influence in the Americas. The doctrine aimed to establish the United States as the dominant power in the Western Hemisphere and protect the independence of newly-formed countries in Latin America. It became a significant milestone in American foreign policy and set the stage for future U.S. involvement in the affairs of Latin America.
