Deadliest Events in Human History

These are the events in human history that has the most death toll in one event.
The Top Ten
1 [100 Million] World War I (Including Spanish Flu Deaths)
2 [60 Million] Conquest of Ming Dynasty
3 [60 Million] World War II
4 [60 Million] Mongol Conquest
5 [60 Million] Atlantic Slave Trade
6 [50 Million] Reign of Mao Zedong

Estimated to be closer to 65 million.

7 [50 Million] Russia Under Joseph Stalin
8 [35 Million] An Shu Rebellions
9 [21 Million] Nazi Germany / Holocaust
10 [20 Million] Conquest of Native Americans