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Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, was assassinated by a Serbian Nationalist over a regional dispute, triggering WWI.
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The first declaration of war came from Austria-Hungary on Serbia as a follow-up to an ultimatum stemming from the assassination of Archducke Ferdinand.
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The Schlieffen Plan was an aggressive military plan developed by Germany to efficiently combat the Allied Powers and swiftly win WWI.
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A battle deep into France between the Germans and the British/French forces that ended the plans for Germany's quick capture of France.
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The Gallipoli Campaign was an invasion of an Ottoman penninsula led by the British that ended as a miserable failure.
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This sinking of a British ocean liner by a German U-Boat swayed American public opinion against Germany.
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The United States finally enters WWI under President Woodrow Wilson after a $250 million arms appropriation bill in response to the sinking of four more ships being traced to Germany.
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Vladimir Lenin and the Bolsheviks successfully overthrow the Russian government and put an end to Russian involvement in WWI.
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The Second Battle of the Marne decisively tilted the war in the Allied Power's favor and was the last major battle initiated by German offensive forces.
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This armistice between the Allied Powers and Germany marked the end of the WWI.
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The formal end of the state of war between Germany and the Allied Powers that required Germany to face massive military and economic consequences (e.g. $442 billion inflation adjusted reparation cost, <100,000 man army, etc.).