What was the name of the message sent from germany to mexico promising that if mexico went to war with the united states, germany would win back territory once owned by mexico?

The name of this message was the "Zimmermann telegram." This is because this message was sent by a German official named Arthur Zimmermann to promise Mexico that if they Mexico joined Germany in the war, Germany would regain its lost territory that the United States had previously obtained. 

Ibelieve it would be homer plessy