The Monroe Doctrine was written by John Quincy Adams who was Secretary of State to President James Monroe. Members of the cabinet as well as the President had input, but Adams was the doctrine’s main author. It was orally presented to Congress by President Monroe on December 2, 1823.
The policy dictated that any interference by European nations or attempts to colonize land on North or South America would be considered an act of aggression towards the United States.
The United States wanted to distance itself from European affairs and stake claim to new land on the two continents. Great Britain offered to join the United States in a joint effort of cooperation within the Western Hemisphere, but this was opposed by Adams who did not want British influence to hinder future expansion of the United States.