well fuck those guys then; if they wish the Confederates had won then they oughta just suck it up and see how much of an authoritarian hellhole it would be. in fact, the CSA (at least in the earlier parts) of TL-191 is probably better than it would be if they had actually won
I am willing to give Turtledove a pass on that, because Longstreet was President and he's awesome.
Honestly, I'd be fine with them stopping at the end of the Great War books. The later parts of American Empire and especially Settling Accounts read like he just pulled up a history of World War II and ran a find and replace tool through it.