What was the impact of the U.S decision to enter world war 1?

The U.S. decision to enter World War I in 1917 significantly shifted the balance of power in favor of the Allies, providing much-needed manpower and resources. American troops bolstered the weary Allied forces, contributing to key victories that ultimately led to the war's conclusion in 1918. The U.S. entry also marked a shift in global politics, establishing the United States as a major world power and leading to its increased involvement in international affairs in the years that followed. Additionally, it set the stage for the League of Nations, although the U.S. would later opt not to join it.