How did the Zimmermann Telegram help push the United States into World War I?

The Zimmermann Telegram was a secret message from Germany to Mexico proposing an alliance if the United States entered the war against Germany. Germany offered to help Mexico regain territory it had lost to the United States. When the telegram became public, it angered many Americans and helped turn public opinion toward joining World War I. Thus, it revealed Germany’s plan to form an alliance with Mexico.

AI-written and checked against the verified answer.