Germany's resumption of unrestricted submarine warfare led to the U.S. declaration of war in 1917 due to various provocations, including the sinking of the Lusitania.
Germany's resumption of unrestricted submarine warfare finally caused the United States to declare war on Germany in 1917. This decision was influenced by the sinking of the Lusitania, with 128 Americans among the casualties, as well as Germany's violation of the Sussex Pledge and the Zimmerman Telegram.
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