Belorussian territory under Poland experienced its own drama. The new Polish state, where ethnic minorities, including Belorussians, Ukrainians, Jews, and Germans, made up one-third of the country's population, began as a democracy. The country's 3.5 million Belorussians were able to open their own primary schools, high schools, and teachers' colleges the government supported cultural activities and Belorussians elected three senators and eleven deputies to the Polish parliament, or Sejm, in 1922.

By 1924, however, Poland's policy toward ethnic minorities had changed drastically. Under the guise of combating communism, most Belorussian schools were closed, and publications in the Belorussian language were banned. The government encouraged ethnic Poles (see Glossary) to settle in the Belorussian region, but at the same time it neglected the overall economic development of the area. The Belorussian region became an agricultural appendage to a more industrialized Poland, and unemployment and land hunger were widespread. Between 1925 and 1938, some 78,000 people emigrated from this part of Poland in search of work, mainly to France and Latin America.

In May 1926, war hero Marshal Józef Pilsudski established an authoritarian regime in Poland. The following year, when the Belorussian Peasant-and-Workers' Union spearheaded a widespread protest against the government's oppressive policies in the Belorussian region, the regime arrested and imprisoned the union's activists. Further governmental policies toward the socalled Eastern Territories (the official name for the Belorussian and Ukrainian regions) were aimed at imposing a Polish and Roman Catholic character on the region.

In 1935 Poland declared that it would no longer be bound by the League of Nations treaty on ethnic minorities, arguing that its own laws were adequate. That same year, many Belorussians in Poland who opposed the government's policies were placed in a concentration camp at Byaroza-Kartuzski (Bereza Kartuska, in Polish). The Belorussians lost their last seat in the Polish Sejm in the general elections of 1935, and the legislation that guaranteed the right of minority communities to have their own schools was repealed in November 1938. The state then involved itself more deeply in religion by attempting to Polonize the Orthodox Church and subordinate it to the government.

Data as of June 1995