This data set contains the data necessary to replicate Table 1 in James D. Fearon and David D. Laitin, Ethnicity,Insurgency, and Civil War, _American Political Science Review_ 97, 1 (February 2003):75-90. A few additional variables are included relevant to claims made in the paper. See Fearon and Laitin, Additional Tables for Ethnicity, Insurgency, and Civil War, at http://www.stanford.edu/group/ethnic/ for more information on the data contained here.