 The racial concentration was enforced by violence for few decades, until restrictive covenants became the preferred way to enforce segregation.Although they were previously rare, racially restrictive covenants among property owners that outlawed the purchase, lease, or occupation of their properties by African Americans became common in Chicago in the 1920s following the Great Migration, especially after the 1926 United States Supreme Court upheld racially restrictive covenants in Corrigan v. Buckley ().During the first half of the 20th Century, The Black Belt was the term for the African-American neighborhood from 22nd Street to 31st Street along State Street on Chicago's South Side.