The purpose of the new citizenship law which was proposed by the new German federal government was to give legal aliens living in Germany a choice to become German citizens without having to give up the nationality which was conferred on them by their parentage or descent. This thesis will question whether this rigid concept should be completely abolished after an assessment of both the constitutionality and the exact implications of the new citizenship law. In the light of the conclusions, the comparative part of this thesis will then focus on a more general approach and will compare the concepts of nationality and domicile with special emphasis on their practical application in both common and civil law jurisdictions. First, there will b...