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The February Revolution begins with strikes, demonstrations, and mutinies in Petrograd
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Czar Nicholas II abdicates and includes his son. The following day, Nicholas' brother, Mikhail announced his refusal to accept the throne. Provisional Government formed
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Lenin returns from exile and arrives in Petrograd via a sealed train
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The July Days begin in Petrograd with spontaneous protests against the Provisional Government; after the Bolsheviks unsuccessfully try to direct these protests into a coup, Lenin is forced into hiding
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Alexander Kerensky becomes Prime Minister of the Provisional Government
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The Kornilov Affair, a failed coup by General Lavr Kornilov, commander of the Russian Army
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The October Revolution - the Bolsheviks take over Petrograd
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The Winter Palace, the last holdout of the Provisional Government, is taken by the Bolsheviks; the Council of People's Commissars (abbreviated as Sovnarkom), led by Lenin, is now in control of Russia
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The Treaty of Brest-Litovsk, between Germany and Russia, is signed and takes Russia out of World War I
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The Bolshevik Party changes its name to the Communist Party
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Russian civil war begins
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Czar Nicholas II and his family are executed
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Russian civil war ends
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Stalin is appointed General Secretary
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The Union of Soviet Socialist Republics (U.S.S.R.) established
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Lenin dies; Stalin will become his successor
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The 1924 Soviet Constitution came into effect.
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The Thirteenth Party Congress, led by Stalin, Comintern chairman Grigory Zinoviev and Politburo chairman Lev Kamenev, denounced Trotsky and his faction, the Left Opposition.
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The Bukharan People's Soviet Republic was incorporated into the Uzbek SSR.
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Trotsky was forced to resign his military offices.
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Tikhon died. The Communist government would not allow elections to the patriarchate to be held; Metropolitan Peter of Krutitsy became the Patriarchal locum tenens according to his will.
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The Uzbek SSR joined the Soviet Union.
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Trotsky was expelled from the Politburo.
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The Fourteenth Party Congress endorsed the leadership of Stalin and his rightist ally Nikolai Bukharin, soundly defeating the New Opposition faction of Kamenev and Zinoviev.
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Sergius affirmed the loyalty of the Russian Orthodox Church to the Soviet government.
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Trotsky and Zinoviev were expelled from the Communist Party.
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The Fifteenth Party Congress expelled the remainder of the United Opposition from the Party.
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First Five Year Plan: Stalin announced the beginning of state industrialisation of the Soviet economy.
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Bukharin was expelled from the Politburo.
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The Gulag was officially established.
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Collectivisation in the USSR: The Central Executive Committee and the Sovnarkom issued the Decree about the Protection of Socialist Property, under which any theft of public property was punishable by death.
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A decree by the Central Executive Committee and the Sovnarkom established a passport system in the Soviet Union.
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First Five-Year Plan: It was announced that the plan had been fulfilled.
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Elections to the Central Committee at the Seventeenth Party Congress revealed Sergey Kirov, the chief of the Leningrad Party, to be the most popular member.
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Kirov was murdered by Leonid Nikolaev, possibly at the behest of Stalin.
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Moscow Trials: The Trial of the Sixteen, in which Kamenev and Grigory Zinoviev were the primary defendants, began.
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Moscow Trials: The defendants in the Trial of the Sixteen were executed.
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The Stalin Constitution came into effect. The Central Executive Committee was renamed the Supreme Soviet of the Soviet Union.
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Moscow Trials: The Second Trial began.
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Moscow Trials: The Second Trial ended. Of seventeen defendants, all but four were sentenced to death.
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Case of Trotskyist Anti-Soviet Military Organization: Mikhail Tukhachevsky, a Marshal of the Soviet Union and hero of the Russian Civil War, was arrested.
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Case of Trotskyist Anti-Soviet Military Organization: Tukhachevsky was executed, with eight other military leaders.
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Peter of Krutitsy was executed in solitary confinement.
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Trial of the Twenty One: The third Moscow Trial, at which Bukharin was the primary defendant, began.
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Trial of the Twenty One: The defendants were executed.
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Soviet invasion of Poland (1939): The Red Army invaded Poland.
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Shelling of Mainila: The Red Army shelled the Russian village of Mainila and blamed the Finns for invented casualties.
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Winter War: The Soviet army attacked Finland.
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Winter War: The Soviet Union established the Finnish Democratic Republic in the border town of Terijoki.
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Winter War: The Moscow Peace Treaty was signed, ending the war at great cost to Finland and anticipating the evacuation of Finnish Karelia.
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The Red Army occupied Lithuania.
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The Red Army occupied Estonia and Latvia.
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Soviet occupation of Bessarabia: Bessarabia and northern Bukovina were occupied by the Soviet Union.
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The Lithuanian SSR was accepted into the Soviet Union.
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The Latvian SSR was annexed by the Soviet Union.
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Trotsky is assassinated by Ramon Mercador on Stalin's orders.
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Operation Barbarossa: Three million Axis soldiers invaded the Soviet Union.
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Continuation War: The Soviet Union launched a major air offensive against Finnish targets.
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Battle of Moscow: Three German armies began an advance on Moscow.
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Battle of Moscow: The Soviet army launched a counterattack from Kalinin.
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Battle of Moscow: The Soviet counteroffensive ended between sixty and one-hundred fifty miles from Moscow.
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The Red Army crossed into Poland.
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Sergius died.
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Soviet occupation of Romania: The Red Army captured Bucharest.
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Continuation War: The Moscow Armistice was signed, ending the war at roughly the prewar borders.
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The Soviet Union captured Warsaw.
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The Soviet Union captured Budapest.