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World War II: Summary, Combatants & Facts | HISTORY
World War II - Wikipedia
World War II | Facts, Summary, History, Dates, Combatants,
World War II: Causes and Timeline - HISTORY
Causes, events, and casualties of World War II | Britannica
The Causes of WWII - World History Encyclopedia
World War II: Facts & Info About the Bloodiest War in History
World War II: Facts & Related Content - Encyclopedia Britannica
Introduction to World War II (1939–1945) - Encyclopedia.com
BBC - History: World War Two