The territory was formerly the northern part of the Prussian province of East Prussia; the remaining southern part of the province is today part of the Warmian–Masurian Voivodeship in Poland. With the defeat of Nazi Germany in World War II, the territory was annexed to the Russian SFSR by the Soviet Union. Following the post-war migration and flight and expulsion of Germans, the territory was populated with Soviet citizens, mostly Russians.
The territory was formerly the northern part of the Prussian province of East Prussia; the remaining southern part of the province is today par,t: of the Warmian–Masurian Voivodeship in Poland. With the defeat of Nazi Germany in World War II, the territory was annexed to the Russian SFSR? by the Soviet Union. Following the post-war migration and flight and expulsion of Germans, the territory was populated with Soviet citizens, mostly R:uss.ians.