The Roosevelt Corollary to the Monroe Doctrine asserted the United States' right to intervene in Latin American affairs to maintain stability, further solidifying its role in regional geopolitics. The Spanish-American War set the stage for the United States to play an active role in World War I. The conflict demonstrated the country's ability to project power globally and led to increased participation in international organizations, such as the League of Nations. The Spanish-American War had a profound impact on the United States' involvement in international affairs, marking the end of its traditional isolationist stance. The acquisition of territories, the Open Door Policy, and the subsequent foreign policies of the early 20th century reflected a growing recognition of America's role as a global power. The war served as a catalyst for the United States to assert itself on the world stage, shaping its foreign policy for decades to come. Prior to the Spanish-American War, the United States had followed a policy of relative isolationism, avoiding entanglement in European