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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.
World War I cryptography. 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 ...
Room 40, also known as 40 O.B. (old building; officially part of NID25), was the cryptanalysis section of the British Admiralty during the First World War. The group, which was formed in October 1914, began when Rear-Admiral Henry Oliver, the Director of Naval Intelligence, gave intercepts from the German radio station at Nauen, near Berlin, to ...
Berlin, Nazi Germany. 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. He was also closely involved in plans to support rebellions in Ireland and in ...
The United States declared war on the German Empire on April 6, 1917, nearly three years after World War I started. A ceasefire and armistice were declared on November 11, 1918. Before entering the war, the U.S. had remained neutral, though it had been an important supplier to the United Kingdom, France, and the other powers of the Allies of ...
Star-Telegram Publisher Amon G. Carter expressed his condolences in a telegram dated Oct. 31, 1944, to Catherine Gunn after the loss of her husband, Star-Telegram war correspondent Stanley Gunn ...
Germany. Mexico. 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.
The Zimmermann telegram: intelligence, diplomacy, and America's entry into World War I (Naval Institute Press, 2012). De Quesada, Alejandro. The Hunt for Pancho Villa: The Columbus Raid and Pershing's Punitive Expedition 1916–17 (Bloomsbury, 2012).