Final answer:
The Zimmermann telegram was a proposal for an alliance between Germany and Mexico, with Germany offering to help Mexico recover Texas, Arizona, and New Mexico from the United States.
Step-by-step explanation:
The content of the Zimmermann telegram sent to Mexico from the German foreign secretary was a proposal for an alliance between Germany and Mexico. Germany proposed that if Mexico joined the war on Germany's side, Germany would help Mexico recover Texas, Arizona, and New Mexico from the United States. The telegram was intercepted by British intelligence and played a significant role in the United States' decision to enter World War I.
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