The city became part of Poland in accordance with the provisions of the post-war Potsdam Conference , and most of the remaining German population was expelled . The last original inhabitants were forced to leave the city in the early 1950s . Between February and September 1945 , the original population of the city was gradually replaced by Poles from central parts of Poland and those expelled from Polish territory annexed by the Soviet Union ( also known as Kresy ) . It was at this time that Gorzów 's significant Tatar and Romani communities arrived . Not having had an agreed Polish name , the town was initially renamed as " Kobylagóra " on 30 May 1945 , later as " Gorzów nad Wartą " on 7 July 1945 and finally " Gorzów Wielkopolski " on 5 November 1946
Potsdam Conference
Potsdam Conference
Gorzów Wielkopolski