sentences:  Under borders changes dictated by the Soviet Union at the Potsdam Conference, Gliwice fell inside Poland's new borders after Germany's defeat in the war.It was incorporated into Poland's Silesian Voivodeship on 18 March 1945, after almost 300 years of being outside of Polish rule.The earliest population estimate of Gliwice from 1880, gives 1,159 people in 1750.