Yes, since May 1948, well that's when they first had their democratic election
A secondary source conclusion is valid.
The fight was an overwhelming victory for the Lakota, Northern Cheyenne, and Arapaho, who were led by several major war leaders, including Crazy Horse and Chief Gall, and had been inspired by the visions of Sitting Bull (Tȟatȟáŋka Íyotake).
The declaration of Independence was written in the 1700s
