The Monroe Doctrine was a U.S. foreign policy issued by President James Monroe in 1823 that stated that any attempt by European powers to colonize or interfere in the affairs of the Western Hemisphere would be viewed as an act of aggression.
The Monroe Doctrine was a U.S. foreign policy issued by President James Monroe in 1823 that stated that any attempt by European powers to colonize or interfere in the affairs of the Western Hemisphere would be viewed as an act of aggression.