It provided legitimacy to the person's rule.
The Lakota (or Sioux) people were nomads
He peoples of West Africa had a rich and varied history and culture
long before European slavers arrived. They had a wide variety of
political arrangements including kingdoms, city-states and other
organisations, each with their own languages and culture.
The empire of Songhai and the kingdoms of Mali, Benin and Kongo were
large and powerful with monarchs heading complex political structures
governing hundreds of thousands of subjects
Because nothing can last forever, not even empires.