The centerpiece of a new exhibit in Los Angeles is a mangled junkyard of a statue, with horse and human limbs glommed together like some kind of zombie Ichabod Crane. Now dismembered beyond recognition, the piece was once a statue of Confederate General Thomas “Stonewall” Jackson. In 2021, the statue — along with its better-known counterpart, a statue of Jackson’s friend and commanding officer Robert E. Lee — was removed from downtown Charlottesville, Virginia, four years after the city council voted to remove them. Lee’s statue met its demise in 2023, torn apart and melted down in secret. The haunting...