What if there would have been a Confederate insurgency in the former Confederate States of America after the end of the American Civil War? Just how much difficulty would the Union have had in stamping out and crushing this insurgency and what effect would this have on the Union's subsequent treatment of the former Confederacy during Reconstruction and beyond?
Something worth noting is that the ex-Confederate terrain that is the most suitable for an insurgency, specifically the Appalachian Mountains, was also the most pro-Republican part of the Southern US in the years and decades after the end of the American Civil War:
Even in 1916, at the height of Jim Crow, the Republican Party (pro-Union and anti-Confederate during the American Civil War) was still competitive in Appalachia due to the fact that, unlike in the rest of the ex-Confederacy, the Republican Party's support in Appalachia was mostly based on whites rather than blacks:
Something worth noting is that the ex-Confederate terrain that is the most suitable for an insurgency, specifically the Appalachian Mountains, was also the most pro-Republican part of the Southern US in the years and decades after the end of the American Civil War:
Even in 1916, at the height of Jim Crow, the Republican Party (pro-Union and anti-Confederate during the American Civil War) was still competitive in Appalachia due to the fact that, unlike in the rest of the ex-Confederacy, the Republican Party's support in Appalachia was mostly based on whites rather than blacks: