Top Ten Wars – listed by total casualties, civilian and military 1. World War II (1939–1945) Estimated deaths: 70–85 million 2. Mongol Conquests (13th century) Estimated deaths: 30–60 million 3. Taiping Rebellion (1850–1864) Estimated deaths: 20–30 million 4. World War I (1914–1918) Estimated deaths: 15–20 million 5. Second Sino-Japanese War (1937–1945) Estimated deaths: 15–20 million 6. An Lushan Rebellion (755–763) Estimated deaths: 13–36 million 7. Qing Conquest of the Ming Dynasty (1616–1662) Estimated deaths: 25 million 8. Dungan Revolt (1862–1877) Estimated deaths: 8–12 million 9. Russian Civil War (1917–1922) Estimated deaths: 7–12 million 10. Napoleonic Wars (1803–1815) Estimated deaths: 3.5–6 million ------------------------------ For comparison, the American Civil War (1861–1865) resulted in an estimated total of 620,000 to 750,000 deaths , making it the deadliest conflict in U.S. history. Key points: Union deaths: ~360...
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