There are many tribes that use other names than using the word Sioux. I can think a handful of Nations that do not use this connotation of belittlement of proud people. For example, Pine Ridge Reservation is in Lakota Oglala Nation, Standing Rock are the Dakota speaking Nation Turtle Mountain. Bois Forte Reservation and many more that I can't think of right now but even in Canada we have the Mosquito First Nation and the Morley First Nation, Carry the Kettle First Nation they all are of the Dakota, Dakota, Lakota language group. I think we have to get away from this conquering Nation and subjugation attitude and be more progressive of how we perceive a people who have lived here for many thousands of years. To look upon them as a people not to be ignored of their proud culture and heritage.
In 1977 the United Nation Declaration of the Rights of Indigenous Peoples of the World in Geneva Switzerland recognized and reaffirmed the rights of Indigenous People of the World. In September 2007 every nation in the world voted for the recognition of the Indigenous People
of the world, with exception of United States, Canada, Australia, and New Zealand, which was a nonbinding agreement, all it meant was good will. It was only in 2016 that Canada has officially recognized the Indigenous people of its country.