In the meantime many people are here and can stay here and can get the citizenship and often don't want it, when they have to give up their old citizenship for that.
Currently about 20% of the population has "migration background". But in most cities more than 40% of poeple under 40 have. The oldest living generation has nearly none. So what's your problem? Der Amerikaner ist die Orchidee unter den MenschenVolker Pispers