Most of the demographic and cultural outcome of the Ostsiedlung was terminated after World War II. The expulsion of Germans after World War II east of the Oder-Neisse line in 1945–48 on the basis of decisions of the Potsdam Conference were later justified by their beneficiaries as a rollback of the Drang nach Osten. "Historical Eastern Germany", which historically was the land of the Baltic people called Old Prussians who had been colonised and assimilated by German Drang Nach Osten, was split between Poland, Russia, and Lithuania (a Baltic country) and repopulated with settlers of the respective ethnicities.