Discover the reason behind the Roosevelt Corollary and its implication. In 1905, Theodore Roosevelt established the Roosevelt Corollary to the Monroe Doctrine. The Corollary stated that the U.S. could intervene in the affairs of an American republic threatened with seizure or intervention by a European country. Roosevelt's view on what makes a "civilized nation" greatly influenced his foreign policy. Roosevelt argued that it was the responsibility of civilized nations, mostly industrial and white, to govern the uncivilized nations that produced raw materials and were "incapable" of governing themselves. Roosevelt's "big stick diplomacy" signified that the U.S. would negotiate peacefully but maintain strength to exert when needed.