In the summer of 1919, a wave of racist violence played out in the U.S. In many ways, the violence of Red Summer was a response to (but NOT caused by) two earlier events: the Great Migration and the return of black soldiers who had fought in World War I.
In July 1900, an interaction between New Orleans police and two black men set off a chain of horrific events. A man hunt, bloodthirsty mobs and senseless murders were all catalyzed by that meeting in a city already grappling with racial tension.
"Black Wall Street" was a nickname for Greenwood, a vibrant suburb of Tulsa, Oklahoma, which was destroyed in a race riot in 1921. And while Greenwood's destruction was definitely the product of racial tensions, the event was much more one-sided.