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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.
Alfred Dillwyn "Dilly" Knox, CMG (23 July 1884 – 27 February 1943) was an English classics scholar and papyrologist at King's College, Cambridge and a codebreaker.As a member of the Room 40 codebreaking unit he helped decrypt the Zimmermann Telegram which brought the USA into the First World War. [1]
The Zimmermann Telegram was intercepted by the British in 1917. In the telegram, the German government formally requested that Mexico join World War I on the side of the Central Powers if the United States declared war on Germany.
Germany sent a telegram in code outlining a plan to aid Mexico in such a conflict and Mexico's reward would be to regain land lost to the U.S. in the Mexican American War (1846–48). The Zimmermann Telegram was intercepted and decoded by the British and given to Wilson, who then made public. Carranza, whose faction had benefited from U.S ...
In appreciation, and if the Central Powers were to win, Mexico would recuperate the territories of Texas, New Mexico, and Arizona, which Mexico had lost in its war against the United States during the Mexican–American War in 1848. The telegram, known as the Zimmermann Telegram was intercepted when the telegram was being wired to the German ...
Germany's Zimmermann Telegram outraged Americans just as German submarines started sinking American merchant ships in the North Atlantic. Wilson asked Congress for "a war to end all wars " that would "make the world safe for democracy", and Congress voted to declare war on Germany on April 6, 1917 . [ 69 ]
With the rise of easily-intercepted wireless telegraphy, codes and ciphers were used extensively in World War I. 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 Zimmermann Telegram was from the German foreign secretary Arthur Zimmermann to the German ambassador Heinrich von Eckardt in Mexico, telling him to offer the Mexican government the return of the states of Arizona, Texas and New Mexico as an inducement to Mexico to side with Germany against the United States.