What was the site where more than 100 fleeing Indians were killed by U. S. troops? Sand Creek Massacre Wounded Knee Little Big Horn

This was Wounded Knee

Wounded Knee Massacre as one of a series of events ahead of the US expansionist policy of settling white people, and the expulsion of the Indians and their accommodation in reservations. Thus, over a hundred Indians, who were fleeing from American troops, were killed in this massacre. Apparently, the US authorities were upset by Ghost Dance performed by the Indians, as a war dance for religious awakening and the return and renewal of their old world before the arrival of the white man.

The answer is: Wounded Knee.