Greenwood is a historic neighborhood and freedom colony in Tulsa, Oklahoma. As one of the most prominent concentrations of African-American businesses in the United States during the early 20th century, it was popularly known as America's "Black Wall Street". It was burned to the ground in the Tulsa race massacre of 1921, in which a local white mob gathered and attacked the area. Between 75 and 300 Black Americans were killed, hundreds more were injured, and the homes of 5,000 were destroyed, leaving them homeless. The massacre was one of the largest in the history of U.S. race relations, destroying the once-thriving Greenwood community.