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This event spurred Austro-Hungary to war with Serbia
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Triggered by the Assasination of Arch-Duke Ferdinand, WWI begins as alliances spur into action to defend their allies.
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First major German setback in WWI. Prevented the success of the Von Schlieffen plan. After months of succesfully pushing the Allied forces back, the central powers were routed and pushed back, leading to the "Race to the Sea".
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Allied and Axis forces tried to envelop each other, eventually reaching the coast of Belgium. Armies remained entrenched for the duration of the war.
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The Lusitania was sunk by a German U-Boat. This causes the U.S to lose much of its isolationist ideologies, and spurred pro-war sentiment. This led to the U.S. joining the war.
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Germany resumed unrestricted submarine warfare after the U.S. joined the war, as it had no reason to be deterred from doing so any more.
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This treaty gave Germany some lands, and took Russia out of WWI. At the time, Russia was undergoing internal struggles so it could no longer remain in the war.
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Last major German offensive. Germany attempted to take the Allies out of the war before the U.S. had a chance to deploy its armies.
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Final Allied offensive against Germany. Germany was forced to surrender, leading to Armistice day.
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On the 11th Hour of the 11th day of the 11th month in 1918, WWI was ended. German Kaiser flees to the neutral territory of Holland.