Sweden gain the all of Pommern at the Westphalian Peace

How would it happen? As I understand it that part of Pommern was its own duchy at the time. Sweden would somehow have to be in a position to annex another sovereign country, and part of the HRE at that.
 
How would it happen? As I understand it that part of Pommern was its own duchy at the time. Sweden would somehow have to be in a position to annex another sovereign country, and part of the HRE at that.

Off the top of my head, I think the last of the Dukes had died during the Thirty Years' War without an heir, leading to the Duchy being partitioned between Brandenburg and Sweden at the end of the war.

This would have probably have been a blow to Brandenburg. I can see Brandenburg trying to get the Duchy from Sweden, so it might join a few of the anti-Swedish coalitions in the second half of the 17th century to get it. This might lead to a faster decline of the Swedish empire. Brandenburg might not join Sweden initially in the 1st Northern War, and instead fight against the Swedes. Past that, I'm not sure.
 

Valdemar II

Banned
The last Duke died in 1636, with his line dying out the heir was his overlord the Elector of Brandenburg, through Sweden occupied the entire Duchy, but France forced/pushed Sweden to give the poorer Hinterpommern to the Elector of Brandenburg.

Pommern had been mostly depopulated (lost over 50% of the population) in the 30YW. The state was somewhat smaller than modern Denmark, through by the time of the Second Empire it had the same population density (it already seem to have reach that in the 18th century). The soil in general was of poor sandy quality, excellent for growing potatoes and cattle ranching but little else. The only thing of value was a few towns (primary Stralsund and Strettin). Sweden under its rule seem to either have mismanage Strattin or the trade network had broken down, because it lost most of it values under their rule. The central position in a united Duchy may result in it being adminstrative centre rather than Stralsund, which may resulting in it doing better.
 
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