Belorussia remains a part of Poland until…

Belorussia remains a part of Poland until Russia, Prussia, and Austria carry out the three partitions of Poland in 1772, 1793, and 1795.

After the last partition, the entire territory of Belorussia becomes part of the Russian Empire, with the exception of a small piece of land in the west, which is held by Prussia.

Orthodox Russia tolerates the Uniate Church to a certain degree, but in 1839, at a time when three-quarters of all Belorussians are Uniates, Tsar Nicholas I (with the support of the Russian Orthodox Church) abolishes the Uniate Church and forces the Uniates to reconvert to Orthodoxy.

He also bans the use of the name "Belorussia," replacing it with the name "Northwest Territory" (Severozapadnyy kray in Russian), and bans the Belorussian language.

Overall, the state pursues a policy of Russification.