In your own words, summarize what Monroe outlined in his Doctrine

Monroe's Doctrine, outlined by President James Monroe in 1823, was a foreign policy stance that asserted the United States' opposition to European colonization or any further colonization efforts in the Western Hemisphere. The doctrine clearly stated that any such colonization would be considered an act of aggression towards the United States. Additionally, it emphasized that the U.S. would not interfere with existing European colonies or ongoing European affairs, but warned against any expansionist ambitions in the Americas. The doctrine aimed to establish the United States as the dominant power in the Western Hemisphere and maintain its own autonomy and security. It also served as a warning to European powers to keep out of America's sphere of influence. Although initially aimed at European countries, the doctrine later extended its scope and became a key aspect of U.S. foreign policy towards Latin American countries, highlighting America's desire to exert influence and protect its interests in the region.