The U.S. officially entered World War I in the year 1917, after initially maintaining a position of neutrality. The entry was prompted by several factors, including unrestricted submarine warfare by Germany and the interception of the Zimmermann Telegram, which revealed German proposals to Mexico. The decision to join the conflict marked a turning point in the war, as American troops provided significant reinforcements to the beleaguered Allied forces. The U.S. entry helped shift the balance in favor of the Allies, ultimately contributing to the defeat of the Central Powers. This involvement also set the stage for America’s emerging role as a global power.