Sitting Bull did not agree to the treaty. He told the Jesuit missionary, Pierre Jean De Smet, who sought him out on behalf of the government: "I wish all to know that I do not propose to sell any part of my country." He continued his hit-and-run attacks on forts in the upper Missouri area throughout the late 1860s and early 1870s. The events of 1866–1868 mark a historically debated period of Sitting Bull's life. According to historian Stanley Vestal, who conducted interviews with surviving Hunkpapa in 1930, Sitting Bull was made "Supreme Chief of the whole Sioux Nation" at this time.
Sitting Bull Family Foundation the Lakota culture and language to young people. These efforts also incorporate environmental and genealogical teachings for the community as a whole. Sitting Bull Family Foundation is incorporated as a nonprofit corporation under the laws of South Dakota and recognized as a public charity by the Internal Revenue Service (IRS), tax exempt under section 501(c)(3). Sitting Bull Family Foundation The Sitting Bull Family Foundation (SBFF) was founded by Ernie Lapointe. According to the organization's website, its mission is to offer the accurate oral history of Sitting Bull through storytelling, by sharing his exemplary cultural and spiritual way of life, and