https://www.ourdocuments.gov/doc.php?flash=false&doc=23
https://history.state.gov/milestones/1801-1829/monroe
http://www.history.com/topics/monroe-doctrine#
http://www.american-historama.org/1801-1828-evolution/monroe-doctrine-1823.htm
http://www.history.com/topics/us-presidents/james-monroe