3. These were the alliances formed that fought against each other in World War I.
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14. Timeline In 1915 Germany sunk a passenger ship and killed 1200 people 128 of them were American. In 1917 United States entered World War 1 with the Triple Entente fighting against the Triple Alliance. Battle of Hulluch in 1916 47 th Brigade 16 th Irish Decimated on one of the most deadliest gas attacks of World War 1. The Archduke of Serbia assassinated by black hands in 1914