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For those of you not familiar with the history of the Polish-Lithuanian Commonwealth, it was largest, and one of the most prosperous European nations by around 1648. The Deluge changed that. The Deluge involved a Dnieper Cossack rebellion, along with invasions from Sweden to the North, Prussia from the West, and Muscovy to the East, all while facing numerous internal revolts. These wars between 1648 and 1660 cost the Commonwealth about a third of its population, and it never fully recovered its former strength.
So, with a POD no later than 1648, is there any way that the Polish-Lithuanian Commonwealth emerges from the Deluge with its borders intact, and possibly great internal unity/strength?