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The Zimmermann telegram (or Zimmermann note or Zimmermann cable) was a secret diplomatic communication issued from the German Foreign Office on January 17, 1917, that proposed a military contract between the German Empire and Mexico if the United States entered World War I against Germany.
The decoding by British Naval intelligence of the Zimmermann telegram helped bring the United States into the war. Trench codes were used by field armies of most of the combatants (Americans, British, French, German) in World War I. [1] The most commonly used codes were simple substitution ciphers. More important messages generally used ...
Arthur Zimmermann (5 October 1864 – 6 June 1940) was State Secretary for Foreign Affairs of the German Empire from 22 November 1916 until his resignation on 6 August 1917. His name is associated with the Zimmermann Telegram during World War I .
Arthur Zimmermann, the German foreign minister, sent the Zimmermann Telegram to Mexico on January 16, 1917. Zimmermann invited Mexico (knowing their resentment towards America since the 1848 Mexican Cession) to join in a war against the United States if the United States declared war on Germany. Germany promised to pay for Mexico's costs and to ...
The nations of Germany and Mexico first established formal diplomatic relations in 1879, following the unification of Germany.In 1917, the German Empire proposed a World War I alliance with Mexico against the United States in the Zimmermann Telegram before it was foiled by British intelligence agents.
Germany's resumption of unrestricted submarine warfare in February 1917, together with the Zimmermann Telegram, brought American entry into World War I on the British side. The Battle of the Atlantic during World War II.
[Note 1] The Berlin Conference of 26–27 March 1917 was the second governmental meeting between Arthur Zimmermann and Ottokar Czernin , the German and Austro-Hungarian foreign ministers, under the chairmanship of Chancellor Theobald von Bethmann Hollweg .
The decryption of the Zimmermann telegram was possible after the failure of the Niedermayer-Hentig Expedition to Afghanistan, when Wilhelm Wassmuss abandoned his codebook, which the Allies later recovered, and allowed the British to decrypt the Zimmermann telegram.