Mapping Occupation
The historian Gregory Downs and the historian and visual designer Scott Nesbit have put together a pretty fantastic visualization of the U.S. Army occupation of the South during Reconstruction. Looking at this really demonstrates the tenuous hold the military had over the white South, even at its height in rural places. The Army guaranteed the civil rights the emancipated slaves demanded but the lack of a long-term and sizable military force meant it could do little about white violence. This is worth your time.