Why US Entered WWI

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  • The Sinking of Lusitania and Unrestricted Submarine Warfare
  • The Sussex Pledge and the Zimmerman Note
  • US Enters World War I
  • On May 7, 1915, a German U-boat torpedoed and sank the Lusitania, a British ocean liner where almost 1,100 perished including 120 Americans. The Germans responded with unrestricted submarine warfare in which submarines sinked vessels without warning.
  • The Sussex Pledge, written in 1916 by Germany to the US, let armed merchant ships, not passenger ships, to be torpedoed without warning. The Zimmerman Note, proposed a military alliance between Germany and Mexico if the US entered WWI against Germany.
  • On April 6, 1917, the U.S. joined its allies-Britain, France, and Russia-to fight in World War I.
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