The Bloodiest Wars

World War II 1939–1945 Worldwide 40,000,000–85,000,000 casualties Mongol conquests 1206–1324 Eurasia 40,000,000 to 70,000,000 casualties Taiping Rebellion 1850–1864 China 20,000,000 to 100,000,000 casualties Conquest of the Americas 1492–1691 Americas 8,400,000 to 137,750,000 casualties Qing dynasty conquest of Ming Dynasty 1616–1662 China 25,000,000 to 25,000,000 casualties Second Sino-Japanese War (Part of World War II) Continue Reading