The Great Sioux Nation, whose real name is the Oceti Sakowin, is comprised of seven sub-nations who spoke the Lakota, Dakota, and Nakota language. The Tituwan sub-nation spoke the Lakota dialect and lived in the western most portion. The Oceti Sakowin (Great Sioux Nation) occupied a vast land area that covered 24 American states and parts of 4 Canadian Provinces. Other smaller nations also lived within the area as the Indigenous concept of territory followed natural law and was much different than the European concept of territory. The people of the Oceti Sakowin (Great Sioux Nation) originated from the mouth of Wind Cave in the Black Hills. The Black Hills were so sacred that they were used for ceremonial, prayers, medicinal, and burial purposes only.
"...CONCLUSION Various historians has determined that the "Sioux Nation Treaty Council" formally formed in 1894, shortly after the Wounded Knee massacre. The Sioux Nation Treaty Council represents all of the Sioux Tribes (Approx 49 Tribes), and all other Sioux Treaty Councils would be subordinate to it, regardless of the Treaty Council's name...." See Bielecki Report pages 7 & 8, Oct. 5, 2008 (Bielecki Report)