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Ok, not in order, and off the top of my head:
The Black Plague, Rwandan genocide, The Great Leap Forward, German aggression WWI, German aggression WWII, Stalin's reign, Bombings of Hiroshima and Nagasaki, Firebombing of Dresden, Euro-American slavery of Africans, Japanese invasion of China, Jewish (and others) genocide by Germans, Spread of European disease to the Americas, American Civil War, Mongol invasions, Vietnam War, Napoleanonic wars, Khmer Rouge, Darfur, Armenian Genocide. Geez, that's 19...