What year did the Monroe Doctrine get established?

The Monroe Doctrine was established in 1823 during President James Monroe's annual message to Congress. This doctrine was a significant policy statement asserting that the Western Hemisphere was no longer open to European colonization and that any attempt by European powers to interfere in the Americas would be viewed as an act of aggression requiring U.S. intervention. The context of the early 19th century, particularly with the aftermath of the Napoleonic Wars and the interest of European powers in Latin America, made this doctrine crucial to American foreign policy. By stating this, Monroe aimed to protect newly independent Latin American nations from European imperialism and to assert the United States' own influence in the region. This strategic move highlighted the U.S.'s growing role on the world stage and reflected a shift towards a more assertive foreign policy in the Americas.