Edward A. Johnson's A School History of the Negro Race appears to be the first African American history textbook. It was first published in 1891; Special Collections has a copy of the revised edition published in 1893.
Background: Logan, Rayford Whittingham. Dictionary of American Negro Biography. New York: Norton, 1982. Call number: E185.96 .L63 1982. Location: Main Library.
1938 - The Negro American Series (four volumes) by Emma E. Akin (Oklahoma City: Harlow)
1938 - Negro Folk Tales for Pupils in the Primary Grades, by Helen Adele Whiting (Washington DC: Associated Publishers)
1938 - Negro Art, Music, and Rhyme for Young Folks, by Helen Adele Whiting (Washington DC: Associated Publishers)
1947 - Little Journeys into Storyland: Stories that Will Live and Lift, by Louis B. Reynolds and Charles L. Paddock (Nashville: Southern Publishing Association)
Indian Life Readers were published by the U.S. Bureau of Indian Affairs in the 1940s. There were three series:
Many of the Indian Life Readers were authored by Ann Nolan Clark, who was deeply interested in Native American culture but not Native American herself. Background on Clark: Gilbert, Ophelia. "Ann Nolan Clark." American Writers for Children Since 1960: Fiction. Ed. Glenn E. Estes. Detroit: Gale, 1986. Dictionary of Literary Biography Vol. 52.
Many of the Indian Life Readers were illustrated by Native American artists, including Hoke Denetsosie and Andrew Standing Soldier. Unfortunately, secondary references about these artists are scarce.