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Which war invention led to the United States joining
WWI? ​

User Glesage
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That would be the Zimmerman Telegram.

Explanation: The Zimmermann Telegram galvanized American public opinion against Germany once and for all. The telegram was considered perhaps Britain’s greatest intelligence coup of World War I and, coupled with American outrage over Germany’s resumption of unrestricted submarine warfare, was the tipping point persuading the U.S. to join the war.
User BlakeTNC
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