It’s easy to overlook the underlying strategic forces of war, to see it solely as a series of errors, accidents, and emotions gone awry. It’s also easy to forget that war shouldn’t happen—and most of the time it doesn’t. Around the world, there are millions of hostile rivalries, yet only a fraction erupt into violence, a fact too many accounts overlook. Christopher Blattman is the Ramalee E. Pearson Professor of Global Conflict Studies at the University of Chicago. He is co-lead the university’s Development Economics Center and the Obama Foundation Scholars Program. In his new book, Why We Fight, Christopher Blattman reminds us that most rivals loathe one another in peace. War is too costly to fight, so enemies almost always find it better to split the pie than spoil it for everyone or struggle over thin slices. In those rare instances when fighting ensues, we should ask: What kept rivals from compromise? He combines decades of economics, political science, psychology, and real-world interventions to lay out the root causes and remedies for war, showing that violence is not the norm; that there are only five reasons why conflict wins over compromise; and how peacemakers turn the tides through tinkering, not transformation. In this interview, I speak to Professor Christopher Blattman about why we fight, the root causes of war, and how we can effectively move to peace. We talk about how to build resilient societies, how best to detect fragility, and the remedies that shift incentives away from violence and get parties back to dealmaking.