As a result of the border changes agreed at the Potsdam Conference in 1945 , the city became part of Poland , with the official name returning to pre-1772 '' Piła '' . The remaining local German population was expelled by Polish and Soviet troops from 1945 to 1948 , while Polish expelees from the east and new settlers from areas of Central Poland resettled the city . The historical city centre was only partially restored
Potsdam Conference
Potsdam Conference
Piła