Theodore Roosevelt's Corollary was an extension of the Monroe Doctrine, articulated in 1904, asserting that the United States had the right to intervene in Latin American countries to maintain stability and order. This policy was rooted in the belief that European intervention in the Western Hemisphere was a threat to American interests, and it positioned the U.S. as a police power in the region. The Corollary reflected America's growing role on the world stage and signaled a shift toward a more active and interventionist foreign policy.