What are the causes of war? To answer this question, Waltz examines the ideas of major thinkers throughout the history of Western civilization. He explores works both by classic political philosophers, such as St. Augustine, Hobbes, Kant, and Rousseau, and by modern psychologists and anthropologists to discover ideas intended to explain war among states and related prescriptions for peace.

This sixth edition has the addition of 13 new selections that highlight 21st-century challenges, including terrorism and weapons of mass destruction. The book includes strategies for using force, together with case studies that illustrate the general principles.

This text debates the pros and cons of nuclear weaponry. It serves as an introduction to an issue that encapsulates some of the most basic themes in international relations: are states rational? Are states sovereign? Does international organization work?

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