What did zimmermann propose that Mexico do if war between Germany and the us?

In the Zimmermann Telegram, Arthur Zimmermann, the German Foreign Secretary, proposed that Mexico form an alliance with Germany and Japan in the event of war between Germany and the United States. Zimmermann suggested that Mexico should reconquer the territories it had lost to the United States in the Mexican-American War, including Texas, New Mexico, and Arizona. In return, Germany promised to provide financial and military support to Mexico.