Which year did the United States enter World War I?

The United States entered World War I in 1917, marking a significant turning point in the conflict. Initially, the war began in Europe in 1914, but the U.S. maintained a policy of neutrality for several years. Factors such as unrestricted submarine warfare by Germany and the Zimmerman Telegram, which proposed a military alliance between Germany and Mexico against the U.S., led to growing public and political pressure to join the war. Ultimately, these events prompted President Woodrow Wilson to ask Congress for a declaration of war, which was granted in April 1917. This entry had a profound impact on the outcome of the war, as American troops and resources significantly bolstered the weary Allied forces.