winoujcie became part of Poland after the Soviet Union imposed new borders, which led to the entire population being expelled.
The entire population was expelled in accordance to the Potsdam Agreement and replaced by ethnic Poles. Poland Swinoujscie [finuit (listen) (German: Swinemunde [si:nmnd, both names meaning Swina [river] mouth; Kashubian: Swina) is a city and seaport on the Baltic Sea and Szczecin Lagoon, located in the extreme north-west of Poland. 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 Swinoujscie, a part of Poland. The Treaty of Zgorzelec signed between the People's Republic of Poland and the German Democratic Republic affirmed the new border, and the GermanPolish Border Treaty of 1990 officially affirmed the existing borders after the fall of the Iron Curtain. 
