I’m always in awe at Mount Rushmore. A surreal feeling washes over me as I walk up the Avenue of Flags and see the four faces gazing off toward the horizon. I think about state historian Doane Robinson, who conceived the idea in the 1920s, and of Peter Norbeck, John Boland and other South Dakota leaders who worked tirelessly to ensure the massive project came to fruition. At the forefront, of...