What led to the Battle of Little Bighorn? the failed flight of a group of Nez Perce to Canada
the surrender and death of Lakota leader Crazy Horse
the belief that the Ghost Dance revival was inciting violence
the U. S. government's attempt to open the Black Hills to development

the U.S. government's attempt to open the Black Hills to development

Explanation:

the government paid religious orders to provide basic education to native american children on reservations. in the late 19th and early 20th centuries, the bureau of indian affairs (bia) founded additional boarding schools based on the assimilation model of the off-reservation carlisle indian industrial school.