ununited germany

It all depends on what you call an ununited Germany. A Germany missing for example Bavaria seems reasonable. Maybe some Bavarians at first want to become part of Germany, but because of later complications decide that they aren't Germans, not unlike the Austrians. Or maybe Hanover remains in personal union with Britain and Prussia doesn't want to pick a fight with Great Britain and Hanover remains outside Germany. Those things I can see happening. Certainly as those things happened OTL. Both Austria and Luxembourg aren't part of Germany. What happened to them could happen to other parts of Germany. Because of Luxembourg and Austria (and going even further back the Netherlands, Belgium and Switserland) you could even say that OTL we don't have a united Germany.
 
An easy way to prevent united Germany is to prevent the rise of nationalism in the first place. There was no German unification movement in the 1700s, so why should the 1800s be 'inevitable'?
 

oberdada

Gone Fishin'
this is the Pre1900 Forum isn't it?
So, my answer is simple: don't let the the Brandenburg-Ansbach branch of the House of Hohenzollern die out in the male line.
Brandenburg and Prussia will stay separated after 1618.
Brandenburg might become important nevertheless, but it is very unlikely for the Hohenzollern ever to become kings.
The Duchy of Prussia will stay under the formal authority of the Polish Kings.
 
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