"Justifying War" offers a comprehensive analysis of the debates surrounding just war in the twentieth and twenty-first centuries. The book examines the evolution of this topic from the imperial wars of the nineteenth century to the challenges of modern warfare. It highlights the role of discourse on human rights and international law, the principles of proportionality during the Cold War, and the redefinition of authority in the context of the rise of terrorist groups. Through a critical engagement with historical and contemporary perspectives, it provides a deep understanding of the complex ethical and legal issues associated with military conflicts. Authored by D. Welch, this well-researched analysis makes the work a valuable resource for students and professionals in the fields of history and political science.