This encyclopedia represents a single source of authoritative information on World War II that provides accessible coverage of the causes, course, and consequences of the war. Its introductory overview essays and cross-referenced A–Z entries explain how various sources of friction culminated in a second worldwide conflict, document the events of the war and why individual battles were won and lost, and identify numerous ways the war has permanently changed the world. The coverage addresses the individuals, campaigns, battles, key weapons systems, strategic decisions, and technological developments of the conflict, as well as the diplomatic, economic, and cultural aspects of World War II.

The five-volume set provides comprehensive information that gives readers insight into the reasons for the war's direction and outcome. Readers will understand the motivations behind Japan's decision to attack the United States, appreciate how the concentration of German military resources on the Eastern Front affected the war's outcome, understand the major strategic decisions of the war and the factors behind them, grasp how the Second Sino-Japanese War contributed to the start of World War II, and see the direct impact of new military technology on the outcomes of the battles during the conflict. The lengthy documents volume represents a valuable repository of additional information for student research.