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The Citizenship Laws Dataset contains information on citizenship laws in 162 countries of the world with reference to the years 1948, 1975, and 2001. The available information concerns the way in which countries regulate citizenship acquisition at birth, with a distinction among jus soli (i.e., by birthplace), jus sanguinis (i.e., by descent), and mixed regimes. We also collect information about naturalization requirements. In addition, the dataset contains information for the main border changes which have affected the countries in the sample under consideration. The dataset further includes the following geo-political dummies: civil law, Latin America, Southern Europe, sub-Saharan Africa, British or Portuguese colony, small country, socialist country, and oil.The dataset is described at length in the following paper:Bertocchi, G. and C. Strozzi (2010), "The Evolution of Citizenship: Economic and Institutional Determinants", Journal of Law and Economics, vol. 53, pp. 95-136.