AHC: A greater Sweden

If you can keep the polish as a super power longer this might galvanise the russians and the Swedish to ally against this miserable power. Also if you face out the Great Northern War I think that would help Sweden too.
 
Anytime before 1611? I'd say that if Sweden becomes expansionistic long before the 30 Years' War and develops interests in northern Germany, chances are they could "Nordic"-ize their gains on the Pomeranian coast, Hamburg, etc. This would serve to expand what's traditionally considered as Sweden, which is definitely necessary seeing as OTL Sweden just never had enough population or economic base to make it big.
 
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