Between 1921 and 1939 the white-red-white flag was used by the Belarusian national movement in West Belarus (part of the Second Polish Republic), both by political organizations like the Belarusian Peasants' and Workers' Union or the Belarusian Christian Democracy, and non-political organizations like the Belarusian Schools Society.
The borders of the BSSR were again altered somewhat after the war (notably the area around the city of Białystok (Belastok Voblast was returned to Poland) but in general they coincide with the borders of the modern Republic of Belarus.
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On October 30 the National Assembly session held in Belastok passed the decision of West Belarus joining the USSR and its unification with the Belarusian Soviet Socialist Republic.
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The corresponding terms of the Molotov–Ribbentrop Pact signed earlier in Moscow were broken, when the German army entered the Soviet occupation zone on June 22, 1941.
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