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U.S entry into WW1
The sinking of the Lusitania in 1915 turned the U.S against Germany.
A German U-boat sunk the Lusitania killing many innocent people and was labeled as a unrestricted submarine warfare.
Germany broke their promise to U.S, The Sussex Pledge, that was supposed to prevent Germany from sinking any U.S ships.
The Zimmerman Note proposed a invitation to ally Germany and Mexico leading to the U.S entering the war.
U.S finally joins the war after all events have occurred and are against Germany.
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