The Tulsa race massacre, also known as the Tulsa race riot or the Black Wall Street massacre, was a two-day-long white supremacist terrorist massacre that took place between May 31 and June 1, 1921, when mobs of white residents, some of whom had been appointed as deputies and armed by city government officials, attacked black residents and destroyed homes and businesses of the Greenwood District in Tulsa, Oklahoma. The event is considered one of the worst incidents of racial violence in American history. The attackers burned and destroyed more than 35 square blocks of the neighborhood—at the time one of the wealthiest black communities in the United States, colloquially known as "Black Wall Street".

White supremacy is the belief that white people are superior to those of other races and thus should dominate them. The belief favors the maintenance and defense of any power and privilege held by white people. White supremacy has roots in the now-discredited doctrine of scientific racism and was a key justification for European colonialism.