How did the Zimmerman telegram affect World War 1?

The Zimmermann Telegram, sent by Germany to Mexico in January 1917, proposed a military alliance against the United States, promising Mexico the territories of Texas, New Mexico, and Arizona if Germany won the war. When the British intercepted and revealed the telegram to the U.S., it stirred public outrage and shifted American opinion in favor of entering World War I. The revelation of Germany's aggressive intentions helped galvanize U.S. support for the war effort, ultimately leading to America's entry into the conflict in April 1917. This shift significantly bolstered the Allies' position and contributed to the eventual defeat of the Central Powers.