WI: No Treaty of Bromberg

Excerpt from the Wikipedia page for the Swedish Deluge (1648-1668)

On November 6, 1657, Poland and Brandenburg-Prussia signed the Treaty of Bromberg. Ducal Prussia, which had previously allied itself with Sweden and attacked Poland, changed sides and guaranteed military support of the Commonwealth, in return for sovereignty (it had been a fief of Poland since 1466). This treaty is regarded as one of the worst mistakes in Polish history.

And in the wiki page for the treaty itself:

The sovereignty in Prussia constituted the basis for the later coronation of the Hohenzollern as Prussian kings. Wehlau-Bromberg remained in effect until it was superseded by the Treaty of Warsaw (18 September 1773) following the First Partition of Poland. The treaty is regarded as one of the biggest mistakes in Polish foreign policy towards Prussia and its consequences were fatal to Poland.

And it's easy to see why, because about half a century after the fact, the now independent Duchy of Brandenburg-Prussia was transformed into the Kingdom of Prussia, and thus kicked off a series of events that led to the fall of Poland-Lithuania itself.

So let's fix that mistake.

What if the Treaty of Bromberg is never signed, and Ducal Prussia remains as a Polish fief?
 
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