International Relations explores the basic concepts of international politics and investigates the causes of war. The selections in this anthology are drawn from major theoretical writings on international relations and offer sophisticated explanations of the forces and factors that shape the behavior of states in the international system. Among the topics covered are the nature of anarchy, power, the state, the international system, and international society. The discussion of the causes of war considers the impact of security dilemmas, balance of power, hegemonic stability, domestic politics, bureaucratic politics, human aggressiveness, and human cognition. This book offers students an accessible introduction to the central principles of international politics and provides a theoretical grounding for further study or research.