The Monroe Doctrine is the best known U.S. policy toward the Western Hemisphere. Buried in a routine annual message delivered to Congress by President James Monroe in December 1823, the doctrine warns European nations that the United States would not tolerate further colonization or puppet monarchs. The doctrine was conceived to meet major concerns of the moment, but it soon became a watchword of U.S. policy in the Western Hemisphere. – Ourdocuments.gov
These databases are all available through the library web page. However, you will need to come in to the library to use them. Be sure to ask the reference librarian if you have questions!