For the Arapaho and Cheyenne tribes, the Sand Creek Massacre of November 29, 1864 doesn’t feel like distant history at all. That’s the day that the Colorado cavalry tortured and killed over 200 people, mostly women, children, and elderly – one of the worst atrocities in U.S. history. To the tribes, it feels like there’s still a lot of healing to do. And so, these days, they’re working to do just that.