Question

the massacre at sand creek was an attack by a colorado militia on peaceful american indians. a colorado militia on a group of dakota warriors. american indians on peaceful white settlers. federal soldiers on a group of cheyenne warriors.

Explanation:

The Sand - Creek Massacre was an 1864 attack by a Colorado militia on a village of peaceful Cheyenne and Arapaho American Indians.

Answer:

a Colorado militia on peaceful American Indians.