Helen Hunt Jackson’s Century of Dishonor

Novelist and poet Helen Jackson’s remarkable “A Century of Dishonor” stirred public outrage over the U.S. government’s mistreatment of Native Americans. Her book centered on seven tribes, among them: Cheyennes, Nez Perce, Sioux, Cherokees and detailed four massacres in particular. At her own expense, she sent a copy of the book to every member of Congress. 

http://www.thewildwest.org/cowboys/wildwestlegendarywomen/204-helenhuntjackson