War in the Twentieth Century is a comprehensive book written by Willard Waller, which delves into the various wars that occurred in the 20th century. The book provides a detailed account of the causes, events and aftermath of the major wars that took place during this period, including World War I, World War II, the Korean War, the Vietnam War, and the Gulf War. The author examines the political, economic, and social factors that led to these wars...