The secret message in which germany asked mexico to attack the united states was called the zimmerman telegram. lusitania telegram. german telegram. kaiser telegram.

The secret message in which Germany asked Mexico to attack the United States was called THE ZIMMERMAN TELEGRAPH.
In the telegraph message sent in January 1917 from the German foreign office, Germany instructed Mexico to attack USA and it also promised Mexico that all the lands that the USA has stolen from them will be recovered and returned back to them if they agree to form alliance with Germany. The telegraph message was intercepted by the American and was made public.