Mountain Meadows Massacre -- Mormons slaughter approximately 120 members of the Baker/Fancher wagon train
Bear River Massacre -- U.S. Army led by Mormon scouts slaughter approximately 450 Indians near Preston Idaho
Wounded Knee Massacre -- U.S. Army slaughters approximately 195 Sioux Indians at the Pine Ridge Indian Reservation
There is clearly a blurry line on how you define “largest”, but what particularly stuck out to me is that this one mentioned Democrats! Which is why I think most media would not want to mention the history of simulator past events.