Depends how far you take this issue. Half of those Germans are still born and raised in Germany. Plus Germans have always been partially Czech, Hungarian, Polish etc for as long as the land existed.
Brazil? Haven't seen many native aboriginal make the Selecao. African, Portuguese, Spanish and Italian - yes and many others I am sure. That is what makes a Brazilian today.
Whole lotta Japanese in those Koreans too btw - and vice versa for that matter.