The flourishing Black business district in Detroit, Mich., photographed in 1942. Arthur S. Siegel via the Library of Congress, CC BY-NDBlack businesses were essential to facilitating the Great Migration of African Americans out of the South between the 1910s and 1960s. Yet, the traditional narrative of the migration as a movement of laborers seeking high-wage jobs obscures the history of African Americans who moved north or west seeking entrepre…