Standing Rock Sioux Tribe

The Standing Rock Indian Reservation is a Hunkpapa Lakota, Sihasapa Lakota and Yanktonai Dakota Native American reservation in North Dakota and South Dakota in the United States. The sixth-largest reservation in land area in the United States, Standing Rock includes all of Sioux County, North Dakota, and all of Corson County, South Dakota, plus slivers of northern Dewey and Ziebach Counties in South Dakota, along their northern county lines at Highway 20. Wikipedia*

On the C-SPAN Networks:
Standing Rock Sioux Tribe has hosted 1 event in the C-SPAN Video Library; the first program was a 2017 Rally.