The Byelorussian Soviet Socialist Republic (abbreviated as Byelorussian SSR or BSSR) (Беларуская Савецкая Сацыялістычная Рэспубліка [БССР] Belaruskaya Savetskaya Satsyyalistychanaya Respublika [BSSR]; Белору́сская Сове́тская Социалисти́ческая Респу́блика [БССР] Belorusskaya Sovetskaya Sotsalisticheskaya Respublika [BSSR]) was one of fifteen constituent republics of the Soviet Union. It was one of the four original founding members of the Soviet Union in 1922, together with the Ukrainian SSR, the Transcaucasian SFSR and the Russian SFSR. The Soviet Republic, along with the Ukrainian SSR and the Soviet Union, were founder members of the United Nations Organization in 1945.
The Soviet republic, Socialist Soviet Republic of Byelorussia, in the lands of Belarus was declared on 1 January 1919, but it took a few years to define its status. Byelorussia was also one of several Soviet Republics occupied by Nazi Germany during World War II. The end of the Soviet Republic occurred in 1991 and the county was later renamed into the current Republic of Belarus.
Polish Autonomous District Dzierzynszczyzna was created within BSSR in 1932 and disbanded in 1935.
Following the August Coup, the Supreme Soviet of Belarus declared independence from the Soviet Union on 25 August 1991. The republic was renamed the Republic of Belarus on September 19 1991. On 8 December 1991 it was a signatory, along with Russia and Ukraine, of the Belavezha Accords, which replaced the Soviet Union with the Commonwealth of Independent States.
Other ethnic/religious groups (1959):
The largest cities were: