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Archduke Franz Ferdinand heir to the throne of the Austro-Hungarian Empire, and his wife are assassinated in Sarajevo.
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Germany declares war on neutral Belgium and invades in a right flanking move designed to defeat France quickly. As a result of this invasion, Britain declares war on Germany.
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Germany declares a submarine blockade of Great Britain. Any ship approaching England is considered a legitimate target.
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U-boat sinks the Lusitania. 1,198 civilians, including 128 Americans die.
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The longest battle of the war, the Battle of Verdun, is fought to a draw with an estimated one million casualties.
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Woodrow Wilson re-elected President of the United States with campaign slogan: "He kept us out of the war"
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President Wilson asks Congress for a declaration of war with Imperial Germany. (Link goes to PBS: American Experience)
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The new Russian government, represented by Leon Trotsky, signs an armistice with Germany.
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Two waves of influenza kill more people than did the war. (Link goes to PBS: American Experience)
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Woodrow Wilson sets sail for the Paris Peace conference