International conflict is neither random nor inexplicable. It is highly structured by antagonisms between a relatively small set of states that regard each other as rivals. Examining the 173 strategic rivalries in operation throughout the nineteenth and twentieth centuries, this book identifies the differences rivalries make in the probability of conflict escalation and analyzes how they interact with serial crises, arms races, alliances and capability advantages. The authors distinguish between rivalries concerning territorial disagreement (space) and rivalries concerning status and...