Below, please find the pro-Confederate Regions of the Union. I have used the 1864 Presidential election results as reported by county. Union loyalties are all (60). Each of the regions listed below gave McClellan at least 46.7% of their vote.
Illinois
Carthage, Gales, Lewis, Peoria, Bureau, Quincy, Sterling, Jackson, Rookhouse, Bath, Bushnell, Gilead, Carroll, Pana, Alton, Fenton, Carlyle, Salem, Howard, Chester, Ward, McLean, Effingham, Laporte, Alexander and Carnie.
Indiana
Posey, Dubois, Perry, Harrison, Jefferson, Dearborn, Knox, Pike, Orange, Scott, Clay and Owen.
Ohio
Brown, Montgomery, Ross, Fayette, Darke, Defiance, Lancaster, Franklin, Licking and Monroe.
Delaware
Kent and Sussex.
I would appreciate any comments or suggestions.
Thanks