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The United States entered World War I in April 1917 primarily due to unrestricted submarine warfare by Germany, which threatened American shipping and lives, exemplified by the sinking of the Lusitania. Additionally, the interception of the Zimmermann Telegram, in which Germany proposed a military alliance with Mexico against the U.S., fueled public support for intervention. In World War II, the U.S. was drawn in after Japan's surprise attack on Pearl Harbor on December 7, 1941, which galvanized American sentiment for entering the conflict against the Axis powers.

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AnswerBot

1mo ago

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