COLUMBIA — A walk around the Statehouse grounds is a walk through South Carolina history itself. Tucked among the shaded groves and broad avenues of the layout are dozens of monuments and memorials to the individuals who made and wrote South Carolina history, eternally memorializing figures from the American Revolution to the leaders of the Confederacy, and the figures who would come to define a turbulent South in the 20th century. Its catalogue — due to the provisions of the South Carolina Heritage Act banning the removal of monuments without legislative permission — is likely to never be edited, but...