Final answer:
The Zimmerman Telegram was a diplomatic proposal from Germany to Mexico during WWI, influencing the US entry into the war and escalating tensions between the countries.
Explanation:
The Zimmerman Telegram was a diplomatic proposal from Germany to Mexico during World War I, suggesting an alliance against the United States. The message offered Mexico the chance to regain lost territories in Texas, New Mexico, and Arizona in exchange for joining the war as a German ally.
This proposal, intercepted by British intelligence in January 1917, played a significant role in the United States' decision to enter World War I. Despite Mexico declining the offer, the Zimmerman Telegram heightened tensions between the nations involved.
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