Following the end of World War II in Europe the territory of Western Belorussia was ceded to the Soviet Union by the Allied Powers, while the city of Białystok with surroundings was returned to Poland.
Setelah akhir Perang Dunia II di Eropa, wilayah Belarusia Barat diserahkan kepada Uni Soviet oleh Sekutu, sedangkan kota Białystok dan sekitarnya diserahkan kembali ke Polandia.