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Gravrillo Princip, member of The Black Hand, assassinated him.
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A British Steamship that was sunk by a German U-Boat with U.S. passengers.
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Zimmerman's Telegram was from Germany to its ambassador to send to Mexico's ambassador to get Mexico to declare war on the U.S. and in return Germany would give Mexico all the land that the U.S. took. However the British intercepted this message and gave it to the U.S when then pulled the U.S. to declare war on Germany.
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