From the bestselling author of Paris 1919 comes a provocative view of war as an essential component of humanity and our history. Is peace an aberration? "Margaret MacMillan has produced another seminal work. . . . She is right that we must, more than ever, think about war. And she has shown us how in this brilliant, elegantly written book."--H.R. McMaster, author of Dereliction of Duty and Battlegrounds: The Fight...