Regarding the discussion about Coldrina and/or Republican Union outposts in Antarctica… Maybe in this universe there won't be a scientific-fiction story equivalent to At the Mountains of Madness, because here those events would be real.
Remember the ruins that Madness!Mussolini explored (before becoming Pope Peter II). Those ruins predated the American Revolution. There are many other PODs, things that went wrong before the failure of the Articles of Confederation. We can't be absolutely sure that there aren't remnants of some kind of ancient (and disturbing) civilization under the ice and rocks of Antarctica!