Theories as to the causes of war, and means for its control, have been advanced since the enlightenment. While some of these theories have correctly intuited pieces of the puzzle, none has been up to the task of controlling war. Indeed, the twentieth century was one of the bloodiest centuries in history. In this book, the founding Chairman of the Board of the United States Institute of Peace proposes a new general theory of war and peace which builds on insights of mainstream "idealist" and "realist" traditions in international relations while integrating the latest empirical findings about war. Building on the finding of the "democratic peace,” that major wars occur only rarely, if at all, bettween well-established democratic nations, the new theory goes beyond the democratic peace, to address "the rest of the story.” In doing so, the author examines the principal pathways to war for democracies, and actions they might take to lessen the risk of war. Most importantly, the book focuses squarely on the aggregate of incentives affecting the decision for war at the individual, national and international levels as the key to understanding war. The result is not only a new theory of war and peace, but a new theory of international relations. This innovative book is essential reading for statesmen, foreign policy experts, historians, military strategists, international lawyers, and, indeed, the general public. Comments about this important book and Journal of Conflict and Security Law review.