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The Sinking of the Lusitania
The Sussex Pledge
The Zimmerman Note
The Lusitania was a British passenger ship that was sunk by a German U-Boat on May 7, 1915. 128 Americans died.
Unrestricted Submarine Warfare
Germany agreed not to sink unarmed passenger ships with out warning. They violated this in 1916 when they torpedoed this French passenger ship. Wilson threatened to break diplomatic relations because of this.
US Enters WW1
A telegram sent from German foreign minister Arthur Zimmerman instructing a Mexican ambassador to convince Mexico to go to war with the U.S. was intercepted by the British (1917).
Germans would attack any ship that belong to its enemies without warning. (1914-1918).
The United States' entry into World War I came in April 1917, after two and a half years of efforts by President Woodrow Wilson to keep the United States neutral during World War I.
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