On December 2, 1823, U.S. President James Monroe delivered a speech establishing American neutrality in future European conflicts. The policy became known as the Monroe Doctrine.
Though a much-discussed principle of American foreign policy, it was undermined by the Spanish-American War, and proved a dead letter as the U. S. entered World War I.
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The Monroe Doctrine told Europe to stay out of the Americas lest they arouse our enmity. I don’t recall the exact wording, but the intent was not to keep the US out of foreign war but to keep Europe out of american ones.