Recapitulation
After World War II over 2.5 million Polish citizens emigrated to the Federal Republic of Germany. Most of them accepted German citizenship and gave up Polish citizenship. However more than 300,000 people decided to retain Polish citizenship and now have both Polish and German citizenships. Almost all who emigrated from Poland at least in their teens are still Polish speakers. Yet their children are usually only German-speaking. It is estimated that former Polish citizens together with the holders of both citizenships living in Germany form a group of 2 million people.
Read more about this topic: Emigration From Poland To Germany After World War II