Change history: A.S.S.R. = Autonomous Soviet Socialist Republic; S.S.R. = Soviet Socialist Republic. An S.S.R. was a constituent republic, or first-level division of the Soviet Union.
1920-04-04: Khanate of Khiva became Khwarazman People's Soviet Republic, also translated People's Republic of Khorezm.
1920-10-05: Emirate of Bukhara became Bukharan People's Soviet Republic.
1921-04-11: Turkestan A.S.S.R. formed from Amu-Darya (Petro-Alexandrovsk, modern Turtkul'), Ferghana (Skobelev), Pamir, Samarkand (Samarkand), Semirechensk (Verniy), and Syr Darya (Tashkent) regions, and the southern part of Transcaspian. (Capitals in parentheses.)
1922-12-30: By the Treaty of Union, Bukhara and Khorezm were linked to the newly formed Soviet Union. Turkestan A.S.S.R. was part of the Russian Soviet Federated Socialist Republic, one of the constituent republics.
