"Accurst be he that first invented war," wrote Christopher Marlowe--a declaration that most of us would take as a literary, not literal, construction. But in this sweeping overview of the rise of civilization, Robert O'Connell finds that war is indeed an invention--an institution that arose due to very specific historical circumstances, an institution that now verges on extinction.
In Ride of the Second Horseman, O'Connell probes the distant human...