Examining onsets of political instability in countries worldwide from 1955 to 2003, we develop a model that distinguishes countries that experienced instability from those that remained stable with a two-year lead time and over 80% accuracy. Intriguingly, the model uses few variables and a...

This article reports and analyzes an updated version of the widely-used Polity II dataset, consisting of annual indicators of institutional democracy and autocracy for 161 states spanning the years from 1946 through 1994. The validity of the Polity III indicators of regime type is supported by...

To assess the relative importance of internal and external sources of anti- Americanism, both cross-sectional and longitudinal data were examined. Multiple regression analysis of the cross-sectional data—which cover 68 countries for the period 1956—1965—revealed that both...

This article proposes and tests a self-generative theory of conflict processes within nations. We dissect the "conflict breeds conflict" truism into three hypotheses: (1) the present extent of conflict simultaneously determines its intensity, while the present intensity of conflict determines...