In case you don't want to read the whole article:
The Tulsa race riot (also called the Tulsa massacre, Greenwood Massacre, or the Black Wall Street Massacre) of 1921[9][10][11][12][13][14] took place on May 31 and June 1, 1921, when mobs of white residents attacked black residents and businesses of the Greenwood District in Tulsa, Oklahoma.[1] It has been called "the single worst incident of racial violence in American history."[15] The attack, carried out on the ground and from private aircraft, destroyed more than 35 square blocks of the district – at that time the wealthiest black community in the United States, known as "Black Wall Street".