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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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World War I begins when Austria-Hungary declares war on Serbia
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trenches
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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
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The First Battle of the Marne begins
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The British ocean liner Lusitania is torpedoed by a German U-boat off the southern coast of Ireland. It sinks in just 18 minutes,
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The German army initiates the modern era of chemical warfare by launching a chlorine attack on Allied trenches
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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
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Germany and the Allies conclude an armistice based largely on Wilson’s Fourteen Points.