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Assasination of Archduke Ferdinand
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The Lusitania is sunken
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Germany promises to warm ships before attacking with the Sussex pledge
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Germany ends the Sussex and goes back to undeclared warfare
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Revolutions in Russia bring the Bolsheviks back to power
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U.S. officially joins the war
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Russia's Lenin is able to sign a peace treaty with Germany and that gives Germany a big fighting advantage.
Russia leaves the war -
Finally the Allies are able to cease fire and end the war.
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The Treaty of Versailles is signed leaving Germany in a pile of debt and embarrasment
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The League of Nations was formed