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Archduke Franz Ferdinand, prince to the Austria-Hungary throne, is assassinated in Sarajevo by a Serbian named Gavrilo Princip
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The British begin a naval blockade of Germany.
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An unofficial truce is declared between the two sides at Christmas
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The Germans begin to use submarines against Allied merchant ships around the island of Britain
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Bulgaria enters the war by declaring war on Serbia
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The Battle of Verdun begins between France and Germany
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The Battle of the Somme begins. Over 1 million soldiers will be wounded or killed
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The British intercept the Zimmerman Telegram in which Germany tries to convince Mexico to join the war. This will result in the United States declaring war on Germany
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The Russians agree to peace with the Central powers and leave the war
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President Woodrow Wilson issues his "Fourteen Points" for peace and an end to the war
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The Second Battle of the Marne begins
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The Treaty of Versailles is signed by Germany and World War I comes to an end