Why Nations Still Fight

by Richard Ned Lebow

Drawing on an original data set of interventions and wars from 1945 to the current day, as well as numerous short case studies, Richard Ned Lebow offers a novel account of their origins and outcomes – one that emphasises miscalculation, failure to conduct meaningful risk assessments, and cultural and political arrogance.  In a successive work to Why Nations Fight (2010), he explains why initiators routinely lose militarily and politically when they resort to force, as well as accounting for why the great powers, in particular, have not learned from their failures. Lebow offers both type- and region-specific forecasts for the future likelihood of interventions and wars. His account reveals the inapplicability of theories nested in the realist and rationalist paradigms to the study of war.  He argues what is needed instead is an “irrationalist” theory, and he takes the initial steps in this direction.

476 pages, Paperback

Published January 8, 2026

About the author

Richard Ned Lebow FBA is an American political scientist best known for his work in international relations, political psychology, classics and philosophy of science. He is Professor of International Political Theory at the Department of War Studies, King's College London, Bye-Fellow of Pembroke College, University of Cambridge, and James O. Freedman Presidential Professor Emeritus at Dartmouth College. Lebow also writes fiction. He has published a novel and collection of short stories and has recently finished a second novel.