"War" by Margaret MacMillan is a comprehensive analysis of the causes, conduct, and consequences of war throughout history. Drawing on a vast range of sources, including personal accounts, political documents, and military strategy, MacMillan explores the human motivations behind war and the complex web of political, economic, and social factors that drive nations to conflict. She examines the impact of war on individuals and societies, from the trauma of soldiers on the front lines to the far-reaching political and economic consequences of global conflicts. Ultimately, MacMillan argues that war is a deeply human phenomenon, shaped by the complex interplay of individual and collective desires, fears, and ambitions.