What are the causes of the race riot that occurred in such a place? First, the Negro in Oklahoma has shared in the sudden prosperity that has come to many of his white brothers, and there are some colored men there who are wealthy. This fact has caused a bitter resentment on the part of the lower order of whites, who feel that these colored men, members of an “inferior race,” are exceedingly presumptuous in achieving greater economic prosperity than they who are members of a divinely ordered superior race. …

One of the charges made against the colored men in Tulsa is that they were “radical.” Questioning the whites more closely regarding the nature of this radicalism, I found it means that Negroes were uncompromisingly denouncing “Jim-Crow” [railroad] cars, lynching, peonage; in short, were asking that the Federal constitutional guaranties of “life, liberty, and the pursuit of happiness” be given regardless of color. The Negroes of Tulsa and other Oklahoma cities are pioneers; men and women who have dared, men and women who have had the initiative and the courage to pull up stakes in other less-favored States and face hardship in a newer one for the sake of greater eventual progress. That type is ever less ready to submit to insult. Those of the whites who seek to maintain the old white group control naturally do not relish seeing Negroes emancipating themselves from the old system.

Walter White, “The Eruption of Tulsa,” Nation 112 (June 29, 1921):