sentences:  Under the border changes forced by the Soviet Union in the post-war Potsdam Agreement, Koszalin became part of Poland as part of the so-called Recovered Territories.The city's German population that had not yet fled was expelled to the remainder of post-war Germany in accordance to the Potsdam Agreement.The city was resettled by Poles and Kashubians, many of whom had been expelled from Polish territory annexed by the Soviets.