To maintain white supremacy they established a new social. [fact]
Systematic devaluation of black womanhood was not simply a direct consequence of race hatred, it was a calculated method of social control. During the reconstruction years, manumitted black people had demonstrated that given the same opportunities as whites they could excel in all areas. Their accomplishments were a direct challenge to racist notions about the inherent inferiority of dark races. In those glorious years, it seemed that black people would quickly and successfully assimilate and amalgamate into the mainstream of American culture. White people reacted to the progress of black people by attempting to return to the old social order. To maintain white supremacy they established a new social order based on apartheid.
bell hooks, Ain't I a Woman_ Black Wome…, loc. 197