Sherman Coolidge, a Northern Arapaho adopted and educated by whites, served 26 years as an Episcopal priest on the reservation on Wind River. During that time, he largely allied himself with government over tribal interests. But later, active in the pan-Indian movement, he came to value preservation of Indian cultures over assimilation.
With the buffalo gone and poverty, hunger and disease increasing, the Eastern Shoshone and Northern Arapaho tribes came under intense pressure in the 1890s to sell their land. In 1896, they sold the U.S. government a piece of their reservation ten miles square—including the splendid hot springs at present Thermopolis, Wyo.