The Zimmerman Telegram

The decrypted telegram revealed Germany's plan to initiate unrestricted submarine warfare and propose an alliance with Mexico against the United States. This explosive message not only aimed to distract the U.S. but also sought to involve Japan in the conflict. The British faced a precarious situation; revealing the telegram to the Americans could galvanize their support for the Allies, but it risked exposing their codebreaking capabilities to the Germans.