What message was sent by the monroe doctrine

The Monroe Doctrine stated that efforts by European nations to colonize land in North or South America, would be viewed as acts of aggression, requiring U.S. interventionThe Monroe Doctrine stated that any interference by European nations with states in North or South America, would also be viewed as acts of aggression, requiring U.S. interventionThe Monroe Doctrine also stated that the United States would not interfere with existing European coloniesThe Monroe Doctrine and lastly it stated that the United States would not interfere with the internal affairs of European countries 

The answer is congress