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Archduke Franz Ferdinand and his wife was are assassinated.
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Austria-Hungary declares war on Serbia.
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Germany declares war on Russia.
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Germany declares war on France.
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The United Kingdom declares war on Germany
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U.S. President Woodrow Wilson announces the U.S. will remain neutral.
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The Battle of Tannenberg begins.
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The First Battle of the Marne begins.
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Battle of Ypres begins.
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The unofficial Christmas truce is declared.
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Germany declares a "war zone" around Great Britain
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The Dardanelles Campaign begins.
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The Dardanelles Campaign begins.
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The Battle of Gallipoli begins.
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The British ocean liner RMS Lusitania is sunk by German U-boat
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The Battle of Verdun begins.
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The Battle of Jutland
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The Battle of the Somme begins.
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The United States declares war on Germany.
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The Battle of Passchendaele
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The Bolsheviks successfully overthrow the Russian government during the 1917 Russian Revolution.
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The armistice agreed upon between the new Russian government and the Central Powers goes into effect.
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U.S. President Woodrow Wilson issues his Fourteen Points to peace.
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Russia signs the Treaty of Brest Litovsk, which is a peace treaty between Russia and the Central Powers.
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Germany launches the Spring Offensive.
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The Second Battle of the Marne begins.
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German Kaiser Wilhelm II abdicates and flees Germany.
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Germany signs the armistice at Compiegne
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The Treaty of Versailles officially ends WWI.