Throughout the centuries Germans practiced the fine art of "Ethnic Cleansing". The last Crusade was in Prussia; to destroy the Balts who were living on their own land. Conquerors kept all, and brought in streams of German peasants to clear the land and work it as serfs. German peasants were encouraged to migrate with tales of free land. The peasants in western German City States were mistreated so much that these Germans fled to Poland; and Prussia, which was the fief of the Polish king.
These did not assimilate and claimed their villages to be German territories. Here begins the confusion in German minds as to what is Germany.[Only a country since @ 1865]. Romantic notions which conveniently dismiss the dispossession and murder of Polish independent/free farmers. These farms were settled by German peasants who were force-marched from South and Central German Principalities. The settlements were never successful as the land was unproductive and the German landholders, who lived in Germany, had little interest in them. The interest of the Prussian State was to keep Poland from reclaiming it.
@ The mass eviction of Germans from central Poland After WWII. Most of these wundervolk were imported from Germany/ Lithuania/ Latvia/ Estonia/ Russia. As per German = lots of accusations about mistreatment; yet nothing about mass murder of Slavs to free the new territories for the mighty and perfect German volk. Karma?
Map of Prussia with towns=