What happened at the Sand Creek Massacre? A. Apache and Navajo Indians attacked a peaceful town of Mexican
settlers.
B. U. S. troops attacked a village of peaceful Cheyenne and Arapaho
Indians.
C. Cheyenne and Arapaho Indians attacked a group of Apache and
Navajo Indians.
D. Mexican troops attacked a fort of U. S. soldiers.

B. U.S. troops attacked a village of peaceful Cheyenne and Arapaho Indians.

Explanation:

This massacre was of peaceful Cheyenne and Arapaho peoples, led by Colonel John Chivington. It occurred because of the struggle for control for the Great Plains of eastern Colorado, which supposedly had an abundance of gold and other resources in the Rocky Mountains nearby. While this movement was initially praised, the attack was eventually condemned when the circumstances were revealed.