Following the Civil War, the Communist regime finally established in Russia, which included many autonomous national entities. Visibility retain independence Belarus, Ukraine, Central Asian and Transcaucasian Federation Khorezm and Bukhara Republic that replaced the Uzbek khanates previous period. In all these government entities were in power communist leadership, they were associated with Russia political system, single economic complex and merged into a single military-political alliance. A question of a union of republics into a single state with Russia. Initially, it was suggested to include defined republic of Russia on human autonomy, but on Lenin, then stopped at the federation of equal Soviet Socialist Republics, Russia, Belarus, Ukraine, and the Transcaucasian republics of the federation. Khorezm and Bukharan People's Soviet Republic stayed in a contractual relationship directly with Russia. The formation of the new state - the Union of Soviet Socialist Republics - was announced December 30, 1922 in Moscow at the First All-Union Congress of Soviets. The first Constitution of the USSR adopted in 1924
During the 1924-1936 biennium. Many Russian autonomies acquired the status of union republics (Kazakh SSR, Kirghiz SSR, Turkmen SSR). Transcaucasian Federation was divided into the Georgian SSR, Armenian SSR and Azerbaijan SSR. In place of the Khorezm and Bukhara republics formed the Uzbek and Tajik SSR. So before the Second World War, the Soviet Union consisted of 11 Soviet Socialist Republics.