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Franz Ferdiand was assianated
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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, after Germany invades Belgium.
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- Austria-Hungary declares war on Russia and Serbia declares war on Germany.
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U.S. President Woodrow Wilson announces the U.S. will remain neutral.
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Battle of Ypres begins
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The unofficial Christmas truce is declared.
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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, U-20
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The Battle of Verdun begins.
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The Battle of Jutland, the major naval battle of the war, begins.
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The United States declares war on Germany.
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The Battle of Passchendaele (also known as the Third Battle of Ypres) begins.
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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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German Kaiser Wilhelm II abdicates and flees Germany.
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The Treaty of Versailles officially ends WWI.