Democratic Institutions Beyond the Nation State: Measuring Institutional Dissimilarity in Federal Countries

The persistence of subnational undemocratic regimes in new democracies has recently revived interest in intra-national patterns of democratization. This article offers new data and a methodological contribution to this literature, emphasizing the measurement of institutional variation across territorial units and levels of government. Developing new measures of the unevenness of democratic institutions within individual countries, and illustrating these measures with an original data set on electoral rules in Mexico at the federal level and across 32 subnational units, we provide tools to enhance the study of democracy, particularly at the subnational level and in federal or decentralized systems. More specifically, we develop measures of institutional characteristics across a country's spatial units and of federal-to-state institutional dissimilarity - what we call system-wide institutional incongruence.