Final answer:
The Zimmermann Telegram revealed Germany's plan to help Mexico regain U.S. territory, leading to increased tensions and influencing the U.S.'s entry into World War I.
Explanation:
The Zimmermann Telegram exposed the German plan to help Mexico regain U.S. territory, specifically Texas, New Mexico, and Arizona. This was part of a proposal for an alliance against the United States during World War I. The intercepted telegram heightened tensions and played a role in the U.S.'s decision to enter the war against Germany.
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