Monroe Doctrine is the best known U.S. policy toward the Western Hemisphere. Buried in a routine annual message delivered to Congress by President James Monroe in December 1823, the doctrine warns European nations that the United States would not tolerate further colonization or puppet monarchs.
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It temporarily avoided a civil war again, popular sovereignty being used as a factor to decide whether the state will be free or a slave state. The slavery issue is becoming worse and more violent. This is igniting the fire of civil war. It effectively repealed both the Missouri Compromise 1820 and Compromise of 1850.
