Zitkala-Sa
She was co-founder of the National Council of American Indians in 1926, which was established to lobby for Native people's right to United States citizenship and other civil rights they had long been denied. Zitkala-Ša served as the council's president until her death in 1938. Zitkala-Ša has been noted as one of the most influential Native American activists of the 20th century. Working with American musician William F. Hanson, Zitkala-Ša wrote the libretto and songs for ''The Sun Dance Opera'' (1913), the first American Indian opera. It was composed in romantic musical style, and based on Sioux and Ute cultural themes. Provided by Wikipedia