Zimmerman Note is not in our dictionary (yet). Here's what it could mean:

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noun

A secret diplomatic communication sent by the German Empire to Mexico in January 1917, proposing a military alliance against the United States in exchange for helping Mexico reclaim territory. Its interception and publication was a key factor in the U.S. entry into World War I.

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The publication of the Zimmerman Note in American newspapers helped turn public opinion decisively in favor of declaring war on Germany.

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In history class, we studied how British intelligence intercepted and decoded the Zimmerman Note, a crucial moment in the First World War.

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