Today we began to look at some examples of American imperialism. In the late 19th century, America also became involved in imperialism. Teddy Roosevelt issued the Roosevelt Corollary. It said the U.S. held the right to intervene if Europe threatened to seize or control any republic in the Americas. In other words, the U.S. told Europe, 'Stay out of the Western hemisphere of you'll have us to deal with.' The U.S. became involved in in Latin America, building the Panama Canal and exerting its influence in Cuba.