The Monroe Doctrine, articulated in 1823, significantly impacted Latin America by asserting that any European intervention in the Americas would be viewed as an act of aggression against the United States. This doctrine sought to protect emerging Latin American nations from European colonization and interference while positioning the U.S. as the dominant power in the Western Hemisphere. As a result, it fostered a sense of nationalism among Latin American countries, encouraging them to assert their sovereignty. However, it also led to U.S. intervention in the region, further complicating relations and shaping the political landscape of Latin America.