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Archduke Franz Ferdinand is Assassinated
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Austria's Ultimatum to Serbia
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Austria declares War on Serbia
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Britain declares war of Germany
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Battle of Tannenberg begins
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First Battle of the Marne Begins
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German U-Boat warfare begins
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Russian Communist Revolution begins
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Trench Warfare Begins
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Japan presents the Twenty-one Demands to China
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Battle of Gallipoli
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Sinking of the Lusitania
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Italy joins the Allies
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Battle of Verdun begins
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Battle of Jutland begins
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Battle of the Somme
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Zimmerman Note discovered
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Unrestricted U-boat resumed
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America Enters the War
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Treaty of Brest-Litovsk signed
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Meuse-Argonne Offensive begins
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Kaiser Wilhelm abdicates
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The Armistice is signed
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Hindenburg Offensive begins
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Treaty of Versailles ends the war