What did the zimmerman telegraph promise mexico?

The Zimmerman Telegram was a diplomatic message from the German Foreign Secretary, Arthur Zimmermann, to the German ambassador in Mexico, Heinrich von Eckardt, that was intercepted and decoded by British intelligence. The telegram proposed that Mexico enter into an alliance with Germany against the United States in the event of war between the United States and Germany. In return, Germany promised to support Mexico in regaining its lost territories in the United States, including Texas, New Mexico, and Arizona.