Claim: Świnoujście was established in the twelfth century and became part of Poland after new borders were imposed leading to the entire population being expelled.
Evidence: 12th century After Germany's defeat in the war, the Soviet Union imposed new borders in eastern Europe at the Potsdam Conference, which made the area, including Świnoujście, a part of Poland. The entire population was expelled in accordance to the Potsdam Agreement and replaced by ethnic Poles.