Voluntary assimilation, known as Indianization in the Americas, is one response that has occurred at other places and in other times when two culture… - Peter Farb

General Phil Sheridan... had urged the destruction of the bison herds, correctly predicting that when they disappeared the Indians would disappear along with them; by 1885 the bison were virtually extinct, and the Indians were starving to death on the plains. ...the Indian Wars finally ended; and with the enforced peace came an economic recession in the West, for the United States government had spent there about one million dollars for every Indian killed by 1870.

Every Messianic movement known to history has arisen in a society that has been subjected to severe stress of contact with an alien culture—involving military defeat, epidemic, and acculturation

The Sioux had been forced to submit to a series of land grabs and to indignities that are almost unbelievable when read about today. ...they were being systematically starved into submission—by the White Bureaucracy—on the little that was left of their reservation in South Dakota. ...From Rosebud, the Ghost Dance spread like prairie fire to the Pine Ridge Sioux and finally to Sitting Bull's people at Standing Rock. The Sioux rebelled; the result was the death of Sitting Bull and the massacre of the Indians (despite their ghost shirts) at Wounded Knee in 1890.