We study the determinants of international migration with special attention to the role of institutional factors other than economic and demographic fundamentals. We evaluate the impact of political institutions and of those institutions specifically targeted at attracting migrants. For a dataset on 19th century migration, we find that economic and demographic differentials play a major role, but that the quality of institutions also matter. We produce evidence that both political and migration institutions represent significant factors of attraction, even after controlling for their potential endogeneity through a set of instruments exploiting colonial history and the institutions inherited from the past. JEL Classification Numbers: F22, P16, O15.

We investigate the evolution of the legal institution of citizenship from a political economy perspective. We first present a median voter model of citizenship laws determination. Next we test the implications of the model on a new dataset on citizenship laws across countries of the world. We show that citizenship laws have responded endogenously to economic and institutional determinants. When facing increasing immigration, countries with a jus soli tradition tend to restrict their legislation, while jus sanguinis countries resist innovation.The welfare burden proves not to be an obstacle for a jus soli legislation, while demographic stagnation encourages it. A high degree of democracy promotes the adoption of jus soli elements, while the instability of state borders determined by decolonization impedes it.Religion and ethnic diversity have no residual impact. JEL Classification Numbers: P16, K40, F22, O15.

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We investigate the origin, impact and evolution of the legal institution of citizenship. We compile a dataset across countries of the world from the 19th century, which documents how citizenship laws have evolved from the common and civil law traditions. Contrary to the predictions of legal theory, we show that the original, exogenously-given citizenship laws did not matter for migration flows during the early, mass migrations period. After WWII, citizenship-granting institutions are no longer exogenous as they are shown to be determined by international migration flows, border stability, the establishment of democracy, the welfare burden, cultural factors, and colonial history.