You can't easily radically extend or replicate the western front. The material cost is psychotic and only accelerates until one side gains material superiority, which forces a breakthrough and general military collapse.
The resemblance is more aesthetic then material.
lol I just realized you turned the revolt of the admirals in an actual revolt. Though I forget, with no OTL Korean war, what became of the original dispute?
The confederacy striking blows against colonialism is pretty amusing, even if it's out weakness as much as it is strength. It's a pity they're unlikely to blunder a small army into the united provinces. Nice use of John S. Mosby imo.
The absolute demographic impact would negligible but killing ten percent of the population over sixty would definitely have an out sized effect on history.
There's the British American Republic. Which is more of a really big North Korea then a proper fascist/communist state in the 60,000 patriots working the uranium city complex sense.
Strategic Bombing is incredibly difficult and resource intensive. Bringing enough ordinance to destroy brute force an economy is neigh impractical and destroying key targets (Railway Junctions, Production Bottlenecks) relies on either luck or (more likely) contrivance.
Some info on Joan
It is post #1454.
I mean Svalbard seems to fulfill every condition needed to make it devastating. Lots of vulnerable people and animals living in close, unhygienic quarters. Given the description it is very virulent, with a significant morality rate, while its spread is a hit...
Given the conditions on Svalbard would it be vulnerable to outbreaks of Joan? I mean it has unsanitary conditions, many potential carriers and a large vulnerable population.