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The heir to the Austro-Hungarian empire and his wife are assassinated in Sarajevo by a member of the "Black Hand".
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In an attempt to flank the French army, Germany declares war on Belgium and invades. Great Britain, who was allied with the neutral country then declares war on Germany.
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1,198 civilians, including 138 Americans aboard the Lusitania die. This would be one of the reasons the United States enter the war.
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The longest battle of the Great War ends with about a million deaths.
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Leon Trotsky and the new Communist governent of Russia sign an armistice with Germany.
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President Woodrow Wilsom claims that his fourteen pointts are the path to world peace.
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Germany and the Allies sign an Armistice, thereby ending the "War to end all Wars".