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How is the Zimmermann Telegram connected to the Mexican Cession?

The Zimmermann Telegram, which was sent in 1917 by German foreign secretary Arthur Zimmermann to the German minister in Mexico, proposed an alliance between Mexico and Germany if the U.S. joined World War I against Germany. Zimmermann also promised German support for Mexico to recover land lost in the Mexican Cession. When the telegram was publicized—it was intercepted by the British and shared with the U.S. government—it created a storm of controversy and helped push the U.S. into the war.