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