Expulsions
In the course of the proceedings, Polish communists had begun to suppress the German population west of the Bóbr river to underline their demand for a border on the Lusatian Neisse. The Allied resolution on the "orderly transfer" of German population became the legitimation of the expulsion of Germans from the certain parts of Central Europe, if they had not already fled from the advancing Red Army.
The expulsion concerned the territories "under Polish administration", i.e. southern East Prussia (Masuria), Farther Pomerania, the New March region of the former Province of Brandenburg, the districts of the Grenzmark Posen-West Prussia, Lower Silesia and those parts of Upper Silesia that had remained with Germany after the 1921 Upper Silesia plebiscite. It further affected the German minority living within the territory of the former Second Polish Republic in Greater Poland, eastern Upper Silesia, Chełmno Land and the Polish Corridor with Danzig.
The Germans in Czechoslovakia, known as Sudeten Germans but also Carpathian Germans, were expelled according to the Beneš decrees—from the Sudetenland region, where they formed a majority, from linguistic enclaves in central Bohemia and Moravia, as well as from the city of Prague.
Though the Potsdam Agreement only refers to Poland, Czechoslovakia and Hungary, expulsions also occurred in Romania, where the Transylvanian Saxons were deported and their property disseized, or in Yugoslavia. In the Soviet territories, Germans not only were expelled from northern East Prussia (Oblast Kaliningrad) but also from the adjacent Lithuanian Klaipeda Region and other lands settled by Baltic Germans.
Read more about this topic: Potsdam Agreement, Aftermath