<Li> 3rd Ciudad Juárez </Li> <P> The Zimmermann Telegram (or Zimmermann Note or Zimmerman Cable) was a secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military alliance between Germany and Mexico in the prior event of the United States entering World War I against Germany . Mexico would recover Texas, Arizona, and New Mexico . The proposal was intercepted and decoded by British intelligence . Revelation of the contents enraged American public opinion, especially after the German Foreign Secretary Arthur Zimmermann publicly admitted the telegram was genuine on March 3, and helped generate support for the United States declaration of war on Germany in April . The decryption was described as the most significant intelligence triumph for Britain during World War I, and one of the earliest occasions on which a piece of signals intelligence influenced world events . </P> <P> The message came in the form of a coded telegram dispatched by Arthur Zimmermann, a Staatssekretär (i.e. a top level civil servant) in the Foreign Office of the German Empire on 19 January 1917 . The message was sent to the German ambassador to Mexico, Heinrich von Eckardt . Zimmermann sent the telegram in anticipation of the resumption of unrestricted submarine warfare by Germany on 1 February, an act the German government presumed would almost certainly lead to war with the United States . The telegram instructed Ambassador Eckardt that if the United States appeared certain to enter the war, he was to approach the Mexican Government with a proposal for military alliance with funding from Germany . </P> <P> The decoded telegram is as follows: </P>

According to the zimmerman note of mexico allied with germany