After the 9/11 attacks, the U.S. and its allies had to change how they fought wars against terrorism. The book "How 9/11 Changed Our Ways of War" looks at how these changes affected our ability to protect democratic values. It examines why we went to war, how we fought it, and what resources were needed. The book discusses the need for strict limits on using force effectively. It also raises questions about future wars, like how to defend against drones, cyber warfare, and targeted assassinations. The contributors include historians, political scientists, and sociologists, who debate on how to identify and follow these limits.