Germany, Austria, Luxembourg or Belgium, which country's nationality is easier to enter?

If you are Jewish, Germany offers 3,000 unconditional naturalization places every year.

If you are an African refugee or a Middle East war refugee, Germany and Belgium may accept you.

Luxembourg is the most difficult country to be naturalized among the four countries, probably because the country is too small and too rich.

Austria is the most easily naturalized country among the four countries for unknown reasons.

Belgium itself is overwhelmed by ethnic problems, so it is generally difficult to accept China people. But it is very generous to African countries such as Rwanda and Congo.