A spontaneous popular uprising in Petrograd, in response to the wartime decay of Russia's economy and morale, culminated in the February Revolution and the toppling of Nicholas II and the imperial government in March 1917. The tsarist autocracy was replaced by the Russian Provisional Government, which intended to conduct elections to the Russian Constituent Assembly and to continue fighting on the side of the Entente in World War I.
At the same time, workers' councils, known in Russian as "Soviets", sprang up across the country. The Bolsheviks, led by Vladimir Lenin, pushed for socialist revolution in the Soviets and on the streets. On 7 November 1917, the Red Guards stormed the Winter Palace in Petrograd, ending the rule of the Provisional Government and leaving all political power to
the Soviets. This event would later be officially known in Soviet bibliographies as the Great October Socialist Revolution. In December, the Bolsheviks signed an armistice with the Central Powers, though by February 1918, fighting had resumed. In March, the Soviets ended involvement in the war and signed the Treaty of Brest-Litovsk.
A long and bloody Civil War ensued between the Reds and the Whites, starting in 1917 and ending in 1923 with the Reds' victory. It included foreign intervention, the execution of the former tsar and his family, and the famine of 1921, which killed about five million people. In March 1921, during a related conflict with Poland, the Peace of Riga was signed,
splitting disputed territories in Belarus and Ukraine between the Republic of Poland and Soviet Russia. Soviet Russia had to resolve similar conflicts with the newly established republics of Estonia, Finland, Latvia, and Lithuania.
On 28 December 1922, a conference of plenipotentiary delegations from the Russian SFSR, the Transcaucasian SFSR, the Ukrainian SSR and the Byelorussian SSR approved the Treaty on the Creation of the USSR and the Declaration of the Creation of the USSR, forming the Union of Soviet Socialist Republics. These two documents were confirmed by the first
Congress of Soviets of the USSR and signed by the heads of the delegations, Mikhail Kalinin, Mikhail Tskhakaya, Mikhail Frunze, Grigory Petrovsky, and Alexander Chervyakov, on 30 December 1922.
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