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Archduke Francis Ferdinand and his wife, Sophia, were assissinated by a Bosnian activist.
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Their demands were so extreme that Serbia had little choice but reject some of them to preserve its sovereignty.
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War was declared on Serbia by Austria.
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Russia was determined to support Serbia when Tsar Nicholas II ordered full mobilization of the Russian army.
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Germany responded to Russian mobilization with its own ultimatum that the Russians must halt their mobilization within twelve hours.
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The Russians ignored Germany's ultimatum, so Germany declared war on Russia.
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Great Britain declares war on Germany. officially over this violation of Belgian neutrality but in fact over the British desire to maintain power.
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Japan joined the Allies primarily to seize control of German territories in Asia.
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An unexpected counterattack by British and French forces under the commander General Joseph Joffre stopped the Germans.
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Any ship approaching Great Britian was considered a target.
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Allies begin nine-month battle for the Turkish peninsula of Gallipoli.
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German u-boat sinks the Lusitania. 1,198 civilians, including 128 Americans died.
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Allied forces begin withdrawal from Gallipoli.
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The longest battle of the war with about an estimated one million casualties. Lasted to December 18th
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Ra Ra Rasputin The self-avowed holy man and confidant to the Tsarina has been murdered by relatives of the Tsar.
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Russia begins to fall apart due to the expenses of the war and the discontent with Tsar Nicholas. Russia withdrew to focus on the internal struggles and the revolution.
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President Wilson asks Congress for a declaration of war with Imperial Germany.
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Over half a million French soldiers mutiny, or "go on strike" and refuse to continue the failed offensive at Chemin des Dames. It lasted until June 1917.
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The first wave of the American Expeditionary Force lands in France.
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Bolshevik socialists, led by Lenin, overthrow Kerensky's government in Russia.
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With the end of thevolution, the Russian Civil War begins.
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Peace Treaty signed by German delegates and Allies in Versailles
