Part 1: Theory -- 1. Why Do Neighbors Fight? Proximity, Interactions, or Territoriality -- 2. Distinguishing Rivals That Go To War from Those That Do Not: A Quantitative Comparative Case Study of the Two Paths to War -- Part 2: Territory and War -- 3. Territorial Disputes and the Probability of War, 1816-1992 -- 4. Mapping the Probability of War: The Role of Territorial Disputes Compared to the Role of Contiguity -- 5. The Effect of Territory on Dispute Escalation among Initiators -- 6. The Probability of War, 1816-1992 -- Part 3: Identifying Paths to War -- 7. Territorial Paths to War: Their Probability of Escalation, 1816-2001 -- 8. Paths to War: The Territorial Origins of War -- Part 4: Territory and Peace -- 9. The Changing Probability of Interstate War, 1816-1992 -- 10. Peace, Globalization, and Territoriality -- Part 5: Conclusion -- 11. The Significance of Territory.