Black non-Standard English is different in grammar (syntax) from Standard English. The advent of the 60's produced authors who explored the full possibilities of language to deal with their themes. The increased use of dialect by black authors, particularly children's authors, was a sign that the nature of the black experience as they wanted to convey it did not have to rely on traditional forms, and literary devices; that they could treat familiar, realistic ideas and situations using a familiar dialect and relate that idea more effectively.
Wells, M. W. (1976). Black Dialect in Children's Books. Reading Horizons: A Journal of Literacy and Language Arts, 17 (1). Retrieved from https://scholarworks.wmich.edu/reading_horizons/vol17/iss1/8