That sounds a little like mine- was it the one attached here?
The map's a vague placeholder for something I was thinking on working on when I've finished the 'Shot Heard Around the World' series (
obligatory plug)- The PoD is intended to be something along the lines of Quebec being admitted as a State in the newly-formed US after a far nastier ARW, which causes all sorts of problems and eventually leads to the dissolution of the USA into its constituent parts.
As for Christiania, I thought the chaotic (and slower) settlement of the American interior by Europeans would lead to certain groups maintaining a strong ethnic identity- and with the major North-American powers rather busy fighting amongst themselves, settlers from such an ethnic group who were in the majority in a certain area could well declare their own state. Think Texas or California, but with Scandanavians instead of Anglos and Robert E Lee as Santa Ana
Not hugely likely perhaps, but as Balkanisation is the primary objective here it sort of makes sense I think.
First post here BTW so hi all