Which statement describes how relations between blacks and whites changed from the antebellum (before the civil war) south to the jim crow era? a. whites and blacks had never associated with one another before the war but were free to do so under jim crow. b. before the war, blacks and whites often had close ties despite slavery, but under jim crow they were kept apart. c. the laws of the jim crow era recognized no differences between blacks and whites. d. after the war, blacks and whites were treated equally in public places, such as restaurants and railroad cars.