type="main" <p>Harrison and Wolf claim that interstate ‘wars are becoming more frequent’. This is an alarming claim deserving serious attention. It is also a highly surprising claim, since recent conflict research tends to find the opposite: incidences of violent conflict are becoming less...</p>

type="main" <p>We show that the frequency of bilateral militarized conflicts between independent states has indeed been rising steadily over the last century. We show that this finding is not driven by any selection bias in our data but a fact that needs to be explained. Finally we highlight our...</p>

Wars are increasingly frequent, and the trend has been steadily upward since 1870.The main tradition of Western political and philosophical thought suggests that extensive economic globalization and democratization over this period should have reduced appetites for war far below their current...

Wars are increasingly frequent, and the trend has been steadily upward since 1870. The main tradition of Western political and philosophical thought suggests that extensive economic globalization and democratization over this period should have reduced appetites for war far below their current...

Case study evidence suggests that inequality between regions in federations affects the risk of secessionist conflict. However, the conventional quantitative literature on civil war has found little support for a link between economic inequality and civil war. We argue that this seeming...

We highlight how efforts to collect systematic data on conflict have helped foster progress in peace and conflict research. The Journal of Peace Research has played a key role in these developments, and has become a leading outlet for the new wave of disaggregated conflict data. We survey...

Scholars argue that third parties make rational calculations and intervene to influence interstate dispute outcomes in favor of their own objectives. Third parties affect not only conflict outcomes but also escalation and duration. Theories of third-party involvement are applied to understand...

Although research on conflict has tended to separately study interstate conflict and civil war, states experiencing civil wars are substantially more likely to become involved in militarized disputes with other states. Scholars have typically focused on opportunistic attacks or diversionary wars...

In the spirit of Lewis Richardson’s original study of the statistics of deadly conflicts, we study the frequency and severity of terrorist attacks worldwide since 1968. We show that these events are uniformly characterized by the phenomenon of “scale invariance,†that is, the...