The changing nature of citizenship legislation

According to the latest available MIPEX data it appears that, across countries, there is a positive relationship between the stock of international migrants and the degree of liberalism in the policies that regulate access to nationality. The significance of this relationship, however, cannot be considered robust, in part due to the presence of outlier countries such as Luxembourg. This suggests that the countries with a larger stock of international migrants are not necessarily those with more liberal citizenship policies…In sum, the evidence shows that citizenship laws have responded endogenously and systematically to historical, economic, and institutional factors and that they have been jointly determined with other institutions.