2. The United States’ Entry into World War I
The United States’ entry into World War I in April 1917 marked a pivotal shift in the conflict’s dynamics. Prior to this, the Allies faced significant challenges against the Central Powers. The infusion of over a million American troops provided a substantial boost, leading to critical victories that contributed to the eventual Allied success. This involvement not only tipped the military balance but also established the U.S. as a principal international player, signaling its emergence as a global power (loc.gov).
