Yes! It startled me when I moved here that everyone, black or white, seemed to accept this. The film sheds some light on why.
Another recent film that might interest you is Descendant, which deals with a different aspect of the tortured racial history of Mobile: the descendants of what is sometimes called "the last slave ship in America" (because slavery had been outlawed in the U.S. by time the ship arrived from Africa). It's about how those descendants are still fighting for justice. My brief intro to it: