Consequently, Germany has recently strictly limited their immigration, and a decline in the number of Germans in the Russian Federation has moderated as they no longer emigrate to Germany and as Kazakh Germans move to Russia instead of Germany.
As conditions for the Germans generally deteriorated in the late 19th century and early 20th century, many Germans migrated from Russia to the Americas and elsewhere, collectively known as Germans from Russia.
After World War II, many of those who retained their German language and customs were forcibly expelled by the Russians and the Poles, with the loss of all their property.
Germans and Dutch settled its valley starting from the Baltic Sea and moving further south with time.
Eventually, Prussia acquired most of the Vistula's watershed, and the central portion of then-Poland became South Prussia.
The western Posen region again became part of Prussia, while what is now central Poland became the Russian client-state Congress Poland.
Many Germans remained in this central region, maintaining their middle-German Prussian dialect, similar to the Silesian dialect, and their religions.