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Zimmermann Telegram

The Zimmermann Telegram as it was sent from Washington, DC, to Ambassador Heinrich von Eckardt, the German ambassador to Mexico.
Mexico in 1916 (in dark green); territory promised to Mexico in the Zimmermann telegram (in light green); and the pre-1836 original Mexican territory (red line)

The Zimmermann Telegram (or Zimmermann Note or Zimmermann Cable) was a secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military contract between the German Empire and Mexico if the United States entered World War I against Germany. With Germany's aid, Mexico would recover Texas, Arizona, and New Mexico. The telegram was intercepted by British intelligence.

Revelation of the contents enraged Americans, especially after German State Secretary for Foreign Affairs Arthur Zimmermann publicly admitted on March 3, 1917, that the telegram was genuine. It helped to generate support for the American declaration of war on Germany in April 1917.[1]

The decryption has been described as the most significant intelligence triumph for Britain during World War I[2] and it marked one of the earliest occasions on which a piece of signal intelligence influenced world events.[3]

  1. ^ Andrew, Christopher (1996). For The President's Eyes Only. Harper Collins. p. 42. ISBN 0-00-638071-9.
  2. ^ Why was the Zimmermann Telegram so important? Gordon Corera BBC News 17 January 2017
  3. ^ "The telegram that brought America into the First World War". BBC History Magazine. January 17, 2017. Retrieved January 17, 2017 – via History Extra.
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