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World War I begins when Austria-Hungary declares war on Serbia.
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The First Battle of the Marne begins. The Germans had advanced within 30 miles of Paris
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Britain and France declare war on the Ottoman Empire.
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Archduke Franz Ferdinand of Austria and his wife, Sophie, are assassinated by a Bosnian Serb nationalist in Sarajevo.
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Germany declares war on Russia, France, and Belgium. Britain declares war on Germany. Austria declares war on Russia. Montenegro declares war on Austria. France declares war on Austria. Britain declares war on Austria. Montenegro declares war on Germany.
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The Second Battle of Ypres begins. The German army initiates the modern era of chemical warfare by launching a chlorine attack on Allied trenches.
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The British ocean liner Lusitania is torpedoed by a German U-boat off the southern coast of Ireland.
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The British and German fleets meet 60 miles off the coast of Jutland, Denmark, in the war’s only major encounter between the world’s two largest sea powers.
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The United States declares war on Germany. In his address to Congress four days earlier, U.S. Pres.
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Germany and the Allies conclude an armistice based largely on Wilson’s Fourteen Points.