Belarusian Democratic Republic in the context of Third Constituent Charter

The Byelorussian Soviet Socialist Republic (BSSR, Byelorussian SSR or Byelorussia; Belarusian: Беларуская Савецкая Сацыялістычная Рэспубліка; Russian: Белорусская Советская Социалистическая Республика), also known as Soviet Belarus or simply Belarus, was a republic of the Soviet Union (USSR). It existed between 1920 and 1922 as an independent state, and afterwards as one of fifteen constituent republics of the 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 Belarusian opposition consists of groups and individuals in Belarus seeking to challenge, from 1988 to 1991, the authorities of Soviet Belarus, and since 1995, the leader of the country Alexander Lukashenko (allied with Vladimir Putin), whom supporters of the movement often consider to be a dictator. Supporters of the movement tend to call for a parliamentary democracy based on a Western model, with freedom of speech and political and religious pluralism. The opposition movement vary in political ideology, ranging from liberals, socialists, anarchists, and Polish minority activists to Belarusian nationalists.

Intermarium (Polish: Międzymorze, Polish pronunciation: [mʲɛnd͡zɨˈmɔʐɛ]) was a post-WWI geopolitical plan conceived by Józef Piłsudski to unite former Polish–Lithuanian Commonwealth lands within a single polity. The plan went through several iterations, some of which anticipated the inclusion of neighbouring states. The proposed multinational polity would have incorporated territories lying between the Baltic, Black, and Adriatic Seas, hence the name Intermarium (Latin for "Between-Seas").

Prospectively a federation of Central and Eastern European countries, the post-World War I Intermarium plan pursued by Piłsudski sought to recruit to the proposed federation the Baltic states (Lithuania, Latvia, Estonia), Finland, Belarus, Ukraine, Hungary, Romania, Yugoslavia, and Czechoslovakia. The Polish name Międzymorze (from między, "between"; and morze, "sea"), meaning "Between-Seas", was rendered into Latin as Intermarium.

The Byelorussian Soviet Socialist Republic (BSSR), Byelorussian SSR or Byelorussia; (Belarusian: Беларуская Савецкая Сацыялістычная Рэспубліка; Russian: Белорусская Советская Социалистическая Республика), also known as Soviet Belarus or simply Belarus, was a republic of the Soviet Union (USSR). It existed between 1920 and 1922 as an independent state, and afterwards as one of fifteen constituent republics of the 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.