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The Russian Social Democratic Labor Party splits into two factions: Mensheviks (minority) and Bolsheviks (majority). The Bolsheviks and their allies occupied government buildings and other strategic locations in Petrograd.
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The October Manifesto, issued by Czar Nicholas II, brings an end to the 1905 Russian Revolution by promising civil liberties and an elected parliament (Duma). Bloody Sunday in St. Petersburg begins the 1905 Russian Revolution.
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World War I begins. Russia entered into World War I in support of the Serbs and their French and British allies.
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Czar Nicholas II assumes supreme command of the Russian Army. Rasputin is murdered.
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The Treaty of Brest-Litovsk, between Germany and Russia, is signed and takes Russia out of World War I. Russian civil war begins.
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Civil War broke out in Russia in late 1917 after the Bolshevik Revolution. The Russian Civil War ended in 1923 with Lenin’s Red Army claiming victory and establishing the Soviet Union.
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Stalin is appointed General Secretary. The Union of Soviet Socialist Republics (U.S.S.R.) established.
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Lenin dies; Stalin will become his successor.