In early 1917, British cryptographers deciphered a telegram from German Foreign Secretary Arthur Zimmermann to Germany’s minister in Mexico. The telegraph encouraged Mexico to invade U.S. territory. The British kept it a secret from the U.S. for more than a month. They wanted to show it to the U.S. at the right time to help draw the U.S into the war on their side.

In early 1917, British cryptographers deciphered a telegram from German Foreign Secretary Arthur Zimmermann to Germany’s minister in Mexico. The telegraph encouraged Mexico to invade U.S. territory. The British kept it a secret from the U.S. for more than a month. They wanted to show it to the U.S. at the right time to help draw the U.S into the war on their side.

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