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Serious comparative research on postwar immigration politics and policy began only 30 years ago and did not really take off until the 1990s. The level of interest of scholars has naturally followed the salience of immigration issues in the politics of liberal democracies. A flood of new research is now appearing, making a review of where research has come so far timely. Immigration research in political science has confronted a number of challenges, several of which are examined here: (a) the merits and limits of comparative case studies, (b) the wedding of economic theory with political analysis, (c) the analysis of the consequences of ethnic diversity on support for redistributive social policies, and (d) the possible contradictions of a popularly supported liberal immigration policy.

Immigration is the driving force behind the rapidly growing ethnic, racial, and religious diversity of Western welfare states. This essay reviews research on the effects of immigration and diversity on the political support for redistributive social programs. A growing body of scholarship finds negative relationships between indicators of ethnic heterogeneity and measures of immigration, on the one hand, and attitudes towards welfare measures and state expenditures on welfare, on the other. Responding to these results, scholars have searched for mediating factors that slow or reverse these effects. As empirical studies multiply it is important to develop theories to make sense of the data. I discuss in-group and out-group theory, reciprocal altruism, and the neoDarwinian theory of ethnic nepotism. I argue that while no theory has been shown to be clearly superior to the others, neoDarwinism is the most comprehensive and should not be dismissed because of its pessimistic implications for immigration, diversity, and welfare states.

Immigration is the driving force behind the rapidly growing ethnic, racial, and religious diversity of Western welfare states. This essay reviews research on the effects of immigration and diversity on the political support for redistributive social programs. A growing body of scholarship finds negative relationships between indicators of ethnic heterogeneity and measures of immigration, on the one hand, and attitudes towards welfare measures and state expenditures on welfare, on the other. Responding to these results, scholars have searched for mediating factors that slow or reverse these effects. As empirical studies multiply it is important to develop theories to make sense of the data. I discuss in-group and out-group theory, reciprocal altruism, and the neoDarwinian theory of ethnic nepotism. I argue that while no theory has been shown to be clearly superior to the others, neoDarwinism is the most comprehensive and should not be dismissed because of its pessimistic implications for immigration, diversity, and welfare states. Adapted from the source document.