Answer :
Before the war, blacks and whites often had close ties despite slavery, but under Jim Crow were kept apart (B). As a result of Jim Crow laws African Americans and white populations in the American south were separated by a large legal apparatus that was created to prevent their interaction and coexistence. Although slavery led to distorted levels of contact between blacks and whites before the Civil War there was more contact than occurred during the Jim Crow period of the south which used racially oppressive laws to segregate races in the South.