In January of 1917, two British cryptographers -- Nigel de Gray and Reverand William Montgomery -- deciphered a telegram sent from German Foreign Minister Arthur Zimmermann to Count von Bernstoff, the German ambassador in Washington. The telegram had two purposes -- the first part informed the ambassador of Germany's decision to begin unrestricted submarine warfare. The second part, on the other hand, was supposed to be forwarded to the German Minister to Mexico, Heinrich von Eckhar

You are instructed to inform the President of Mexico of the above in the greatest confidence as soon as it is certain that there will be an outbreak of war with the United States and suggest that the President of Mexico, on his own initiative, should communicate with Japan suggesting adherence at once to this plan; at the same time, offer to mediate between Germany and Japan.

On the first of February we intend to begin submarine warfare unrestricted. In spite of this, it is our intention to endeavor to keep neutral the United States of America.

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