Political party ideology and immigration policy reform an empirical enquiry

What drives the restrictiveness of immigration reforms? To what extent does the political ideology of parties in government and parliament matter? Drawing on immigration policy data offering unprecedented historical and geographical coverage, we analyse the drivers of immigration reforms in 21 Western immigration countries between 1970 and 2012. Our results show that there is no robust effect of the political ideology of governments and parliaments on the overall restrictiveness of immigration reforms. Partisan effects are limited to certain migration policy areas, primarily to integration policies, and to certain migrant groups, particularly asylum seekers and undocumented migrants. In contrast, political party ideology does not fundamentally shape decisions on the core of immigration regimes, such as entry policies or policies towards labour and family migrants. Our findings also showcase the importance of international policy diffusion and of trade-offs between reforms in different policy areas. Overall, the analysis highlights that although immigration is subject to heated debates in the public sphere and extensive political bargaining, the actual policies enacted seem primarily driven by factors such as economic growth, social welfare protection and the structure of political systems that are largely independent of the political ideology of parties in power.