Should peace be attributed mainly to democracy or to some intervening variable that influences both democracy and conflict? A second, perhaps related question is whether or to what extent democratization is driven by external drivers of threat. If regime type helps explain external conflict, does external conflict also help explain regime type? By examining the relationships among strategic rivalry, unstable boundaries, democracy, and interstate conflict in a regional context, we find that rivalry and unstable boundaries are alternative manifestations of external threat. Both have significant, if not identical effects on stimulating interstate conflict. Regime type does not appear to have an independent effect on interstate conflict when we take either rivalries or unstable boundaries into consideration. At the same time, we also find that external threat indicators negatively predict changes in democratization. In short, greater threat is associated with less democratization.Explaining why states become involved in conflict is a core concern in the study of international relations. Explaining why states become more democratic is a core interest in the comparative study of politics. While we remain reluctant to combine these foci, we know much more today than we did 25-30 years ago about the factors encouraging or discouraging conflict and democracy. Yet there is always the possibility that some of what we think we know is not quite accurate. For instance, contentions about the democratic peace have been important drivers in improving our collective understanding of conflict processes. The focus has largely been placed on how democratic political systems and their decision-makers supposedly do things differently than autocratic political systems and their respective decision-makers. We can generate long lists of how regime types differ in international politics but we still don't agree on why regime type should make so much difference. One possibility at UNIV OF PITTSBURGH on June 19, 2015 cmp.sagepub.com Downloaded from 1 Crescenzi and Enterline (1999: 93) conduct a time series investigation of the relationships between democracy, democratization, and interstate war from 1816 to 1992. They find that the statistical strength and sign of the relationships among these variables reflect strong spatial and temporal heterogeneity. Hence, they conclude that the regional level, rather than the global level, holds more promise for understanding the interrelationships between democratization and interstate conflict.