A groundbreaking examination of a central question in international relations: Do states act rationally?   To understand world politics, you need to understand how states think. Are states rational? Much of international relations theory assumes that they are. But many scholars believe that political leaders rarely act rationally. The issue is crucial for both the study and practice of international politics, for only if states are rational can scholars and policymakers understand and predict their behavior.   John J. Mearsheimer and Sebastian Rosato argue that rational decisions in...