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The Monroe Doctrine is one of the longest-standing tenets

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The Monroe Doctrine is still active today, not allowing anyone to colonize on U.S. land

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Doctrine noted that the United States would also not interfere with existing European colonies or ge in the internal concerns of European countries.

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In 1823 the United States had no military power to enforce the Monroe Doctrine. The Monroe Doctrine nevertheless became an important element in American foreign policy and has remained so for more than 170 years

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The president issued a statement, later know as the Monroe Doctrine, on December 2, 1823

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In 1822 Spain had asked France, Austria, Russia, and Prussia-the Quadruple Alliance-for help in its fight against revolutionary forces in South America. The possibility of European involvement in North American led President Monroe to take action .

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The Monroe Doctrine was like a big fence setup by Uncle Sam.

If any type attempt to interfere into America was to happen by European nations, by would be viewed as a act of aggression, which could start some things that don't need to be started

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By the Monroe Doctrine rule, European countries are not allowed to enter U.S. or colonize on U.S land