In February, 1917, the U.S. learned of the ________ Telegram in which Germany offered a military alliance to Mexico if the U.S. entered the war on the Allied side.

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The Zimmermann Telegram 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 event that the United States entered World War I against Germany. The interception and decoding of this telegram by British intelligence was a significant factor in prompting the United States to enter the war.