While territory, oil, and water are frequently mentioned as resources likely to promote interstate conflict, diamonds have emerged as a prominent factor in explanations of civil war. In this article, the authors report on a new database on diamond deposits and production and analyze the...

A number of recent studies argue that there is decline in armed conflict within and between nations. Gohdes and Price run against the grain in arguing that there is no evidence for a decrease in battle deaths in armed conflicts after World War II and that the trend reported in our earlier...

Proponents of the democratic peace have been criticized for failing to discuss colonial wars. Democratic countries have repeatedly fought such wars, which critics hold to be incompatible with democratic peace theory. Three reasons are suggested to explain why colonial wars do not invalidate the...

Peace and regime type can be examined at the dyadic, nation, and system levels. At the dyadic level, it is well established that democracies rarely if ever fight each other. At the national level, the broad consensus is that there is no significant relationship between democracy and war...

The Middle East is one of the most conflict-prone regions—butwhy? The Collier-Hoeffler model of civil war provides the starting point for our analysis. In an application to Africa, Collier and Hoeffler found poverty to be the most significant predictor of conflict. For conflict in the...

This article introduces the Polity IIId (“d†is for dates) data set. The Polity IIId project codes the precise dates of changes in political structure identified by Polity III for all independent countries in the international system from 1800 to 1994. By moving from annual...