https://en.wikipedia.org/wiki/Monroe_Doctrine

Notice how President Trump managed to mention the Monroe Doctrine in his speech today.😎

"The Monroe Doctrine is a United States foreign policy position that opposes European colonialism in the Western Hemisphere. It holds that any intervention in the political affairs of the Americas by foreign powers is a potentially hostile act against the United States.[1] The doctrine was central to American grand strategy in the 20th century.[2]"