WI: Swedish Trondheim

In the peace of Roskilde in 1658, Sweden conquered the Scanian lands, Bohuslän, Bornholm and Trondheim (as well as permanently gaining Halland, which had earlier been "borrowed" for 30 years in the peace of Brömsebro in 1645). In the peace of Copenhagen in 1660, Sweden would give Bornholm and Trondheim back to Denmark, while keeping the Scanian lands and Bohuslän.

800px-Scandinavia_1658.gif


The question is, what would happen if Sweden kept the Norwegian province of Trondheim (aka Trøndelag)?

This would give Sweden direct access to the Atlantic sea (granted, Sweden's west coast gives direct access as well, but then you have to go through the Skagerak sound which is surrounded by Denmark and Norway..). It would also be a staging point for further conquest of Norwegian lands, perhaps even the North Sea territories of Iceland and Faroe Islands.
 
Trondheim is wrongly placed on that map btw.
In otl the city was liberated in the fall of 58 and the Swedish troppes surrendered in December of that year. The area is hard to reach and supply for the sweds, as cross country is pretty meak even today. It is going to be really really hard to keep.
But given the premis its very unlikely norway will keep the north, so that will probably also fall to sweden. The extremely important fishing areas will benefit Sweden, and they will have ice free ports. Much less Pomor trade than in otl, probably more Finnish settlers (Kvenes) or that they will make up more of the population of the northern areas (they practiced a form of agrikultur that worked well in the north).
Trondheim its self would probably not change that much, it will still be an important city for trade, it might even do better as more trade will go tru it than Bergen as compared to OTL. Its still the second or third largest norwegian city, and is important for historical reasons so how Swedish it will become is hard to say.
 
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