The US played a critical role in World War I by entering the conflict in 1917 and providing crucial support to the Allied Powers, ultimately tipping the balance in their favor. The US also played a key role in the negotiation of the Treaty of Versailles and the establishment of the League of Nations, demonstrating its growing influence on the global stage. Additionally, US involvement in World War I marked the beginning of its emergence as a superpower and set the stage for its leadership in international affairs in the 20th century.
