Which U.S. President's doctrine forbids European interference in the Americas?

Answer: James Monroe. 

The Monroe Doctrine was a U.S. policy of opposing European colonialism in the Americas beginning in 1823. It stated that further efforts by European nations to take control of any independent state in North or South America would be viewed as "the manifestation of an unfriendly disposition toward the United States." At the same time, the doctrine noted that the U.S. would recognize and not interfere with existing European colonies nor meddle in the internal concerns of European countries. The Doctrine was issued in 1823 at a time when nearly all Latin American colonies of Spain and Portugal had achieved or were at the point of gaining independence from the Portuguese and Spanish Empires.

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