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Emperor Franz Joseph of Austria-Hungary declares war on Serbia.
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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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U-boat sinks the Lusitania. 1,198 civilians, including 128 Americans die.
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British use gas in battle near Loos, but shifting winds cause 60,000 British casualties.
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British conscription law goes into effect
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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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President Wilson asks Congress for a declaration of war with Imperial Germany. (Link goes to PBS: American Experience)
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American troops in France fire their first shot in trench warfare.
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German shells land on Paris.
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At eleven o'clock on the eleventh day of the eleventh month of 1918, the war ends as Germany and Allies sign an Armistice.