Some historians claim that the racial terror connected with "Red Summer" began as early as 1917 during the bloody massacre that occurred in East St. Louis, Illinois, a barbaric pogrom that would eventually set the stage for the 1921 Tulsa Race Massacre, one of the worst episodes of post-Civil War racial violence ever committed against Black Americans. The Tulsa Massacre left as many as 300 Black people dead and destroyed more than 35 square blocks of Greenwood, an all-Black community so wealthy, the philosopher Booker T. Washington called it "Negro Wall Street." [Red Summer: When Racists Mobs Ruled]