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June 28 - Archduke Franz Ferdinand, heir to Austria-Hungary's throne, and his wife, Sophie, are assassinated by Serbian nationalist Gavrilo Princip while the couple were visiting Sarajevo
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July 28 - Austria-Hungary declares war on Serbia
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August 1 - 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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The Battle of Tannenberg begins.
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The United Kingdom announces that the North Sea is a military area, effectively creating a blockade of goods into Germany.
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The Dardanelles Campaign begins.
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The Battle of Gallipoli begins.
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The Battle of Verdun begins. The Battle of Verdun was the longest battle of World War I and was one of the bloodiest.
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The Battle of the Somme begins. During the Battle of the Somme, tanks are first introduced into battle
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The United States declares war on Germany
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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 flying ace, Baron Manfred von Richthofen (more commonly known as the Red Baron), is shot down.
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-Germany signs the armistice at Compiegne, France. Fighting ends on the 11th hour of the 11th day of the 11th month