The Monroe Doctrine established the principle that the Western Hemisphere is a U.S. sphere of influence.

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The Monroe Doctrine, first articulated by President James Monroe in 1823, declared that further efforts by European nations to colonize land or interfere with states in North or South America would be viewed as acts of aggression, requiring U.S. intervention. It established the idea that the Western Hemisphere was under the protection of the U.S. and served as a justification for U.S. intervention in various Latin American countries throughout the 19th and 20th centuries.

The Monroe Doctrine Established the Principle That the Western Hemisphere