President James Monroe's gave an address to Congress on Dec. 2, 1823. In this address, a doctrine of U. S. foreign policy was made. The points were as follows: (1) "the American continents, by the free and independent condition which they have assumed and maintain, are henceforth not to be considered as subjects for future colonization by any European powers" (2) "we should consider any attempt by the nations of Europe to extend their system to any portion of this hemisphere as dangerous to our peace and safety" and (3) "in the wars of the European powers in matters relating to themselves we have never taken part, nor does it comport with our policy so to do." Monroe Doctrine, United States Congressional records, public domain.

The reason for the doctrine was a rumor in Europe that France would send troops to America to put down the revolts in the Spanish colonies. British Foreign Secretary George Canning had wanted the British and Americans to protest against European intervention in the New World. Monroe sent his message to Congress. Canning then talked the French government out of sending troops. Monroe considered that the warning to Europe a sound diplomatic move. The principles he stated did not receive the name Monroe Doctrine until 1853. Many people believed this doctrine would protect the United States against foreign troops from ever threatening America.

This Doctrine was used to stop missiles from being stationed in Cuba.