The Zimmerman Telegram proposed a Germany-Mexico alliance against the US, impacting US entry into WWI.
Zimmerman Telegram was a communication sent by a German ambassador proposing an alliance with Mexico against the United States, offering to help Mexico reconquer lost territories. This led to increased tensions along the US-Mexican border despite Mexico not seriously considering aiding Germany.
The telegram played a significant role in pushing the United States towards entering World War I, especially coupled with the resumption of unrestricted submarine warfare by Germany, which led to a declaration of war by the US against Germany in April 1917.
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