The logical progression of modern colonialism begins with economic penetration and graduates to a sphere of influence, then to protectorate status or indirect control, military occupation, and finally annexation. This corresponds to the process experienced by the Sioux people in relation to the United States. The economic penetration of fur traders brought the Sioux within the US sphere of influence. The transformation of Fort Laramie from a trading post, the center of Sioux trade, to a US Army outpost in the mid-nineteenth century indicates the integral relationship between trade and colonial control. Growing protectorate status established through treaties culminated in the 1868 Sioux treaty, followed by military occupation achieved by extreme exemplary violence, such as at Wounded Knee in 1890, and finally dependency. Annexation by the United States is marked symbolically by the imposition of US citizenship on the Sioux (and most other Indians) in 1924. Mathew King and other traditional Sioux saw the siege of Wounded Knee in 1973 as a turning point, although the violent backlash that followed was harsh.

Roxanne Dunbar-Ortiz, An Indigenous Peoples' Hist…, loc. 422834