On any given Saturday, thousands of people pass by “Old Joe” and never give him a second thought. But Gainesville’s monument to the Confederacy was the center of attention this weekend, the focal point of a demonstration, thankfully peaceful, geared toward having it join the rubbish pile of history. In light of the tragedy of Charlottesville, Va., similar demonstrations are taking place across the South, where Confederate memorials can be found in both big cities and small towns, and throughout a nation still working to heal wounds from a war that ended 150 years ago.