Byelorussian Soviet Socialist Republic

The Byelorussian Soviet Socialist Republic (BSSR), also known as the Byelorussian SSR, Byelorussia, or simply Belarus, was a communist state from 1920 to 1922 and then one of fifteen constituent republics of the Soviet Union (USSR) from 1922 to 1991, with its own legislation from 1990 to 1991. The republic was ruled by the Communist Party of Byelorussia. It was also known as the White Russian Soviet Socialist Republic. Minsk was the capital and largest city of the republic. Following the Treaty of Brest-Litovsk in March 1918, which ended Russia's involvement in World War I, the Belarusian Democratic Republic (BDR) was proclaimed under German occupation; however, as German troops left, the Socialist Soviet Republic of Byelorussia was established in its place by the Bolsheviks in December, and it was later merged with the Lithuanian Soviet Socialist Republic in 1919 to form the Socialist Soviet Republic of Lithuania and Belorussia, which ceased to exist as a result of the Polish occupation during the Polish–Soviet War. Following a peace treaty with Lithuania, the Socialist Soviet Republic of Byelorussia was re-founded on 31 July 1920 and later became known as the Byelorussian Soviet Socialist Republic. The BSSR became one of the four founding members of the Soviet Union in December 1922, together with the republics of Russia, Transcaucasia, and Ukraine. Byelorussia was one of several Soviet republics occupied by Nazi Germany during World War II. It was one of the most develope