Answer:
Arthur Zimmermann
Step-by-step explanation:
Arthur Zimmermann was the German Foreign Minister (the equivalent of the U.S. Secretary of State) in 1917.
He sent an encripted telegram to the German ambassador in Mexico in the same year.
The telegram was an invitation for Mexico to join with Germany in a future war against he United States. Zimmermann tried to convice Mexico by promising the defeat of America, and the recovery of the former Mexican territories lost during the Mexican-American War of 1846-1848.