 It remained a mostly white neighborhood until the construction of the Millcreek Expressway in the 1940s, which displaced residents from the black West End neighborhood.At that time realtors only "permitted" blacks to move into neighborhoods which already had a black population, and Avondale had had black residents since the mid-nineteenth century.After blacks began relocating to Avondale, it split into two increasingly distinct and separate North and South neighborhoods.