Wikipedia
(, literally east settling), also called German eastward expansion, was the medieval eastward migration and settlement of German speakers from the Holy Roman Empire (primarily present-day southern and western Germany) into less-populated regions of eastern Central Europe. The affected area roughly stretched from Slovenia to Estonia, and southwards into Transylvania. In part, followed the territorial expansion of the Empire and the Teutonic Order.
According to Jedlicki (1950), in many cases the term "German colonization" does not refer to an actual migration of Germans, but rather to the internal migration of native populations (Poles, Hungarians, etc.) from the countryside to the cities, which then adopted laws modeled on those of the German towns of Magdeburg and Lübeck. German historians of the nineteenth and twentieth centuries often exaggerated the importance of the adoption of Salic law and settlement in Central and Eastern Europe for political reasons. While the phenomenon did increase the economic wellbeing of destination countries, at least some of them, like medieval Poland, were already quite developed economically and politically in their own right, and the local Slavic population was already far more strongly established in its towns than previously believed: the whole process took part in territories where stable Slavic organisational structures already existed.
Before and during the time of German settlement, late medieval Central and Eastern European societies underwent deep cultural changes in demography, religion, law and administration, agriculture, settlement numbers and structures. Thus is part of a process termed ("east colonization") or ("high medieval land consolidation"), although these terms are sometimes used synonymously.
Ethnic conflicts erupted between the newly arrived settlers and local populations, sometimes bloody, and expulsions of native populations are also known of. In several areas subject to the , the existing population was later discriminated against and pushed away from administration.
In the 20th century the was heavily exploited by German nationalists, including the Nazis, to press the territorial claims of Germany and to demonstrate supposed German superiority over non-Germanic peoples, whose cultural, urban and scientific achievements in that era were rejected and presented as German.