 His primary rationale was his claim that black African slaves and their descendants were never intended to be part of the American social and political landscape.Taney then spent many pages reviewing laws from various U.S. states that involved the status of black Americans at the time of the Constitution's drafting in 1787.He concluded that these laws showed that a "perpetual and impassable barrier was intended to be erected between the white race and the one which they had reduced to slavery."