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For decades, few talked about what happened in this city when a white mob descended on Greenwood Avenue, a black business district so prosperous it was dubbed “the Negro Wall Street” by Booker T. Washington.

For two days beginning May 31, 1921, the mob set fire to hundreds of black-owned businesses and homes in Greenwood. More than 300 black people were killed. More than 10,000 black people were left homeless, and 40 blocks were left smoldering. Survivors recounted black bodies loaded on trains and dumped off bridges into the Arkansas River and, most frequently, tossed into mass graves.