alternatehistory.com

As the tin says. IOTL, the Habsburgs dominated the HRE (and for all intents and purposes, Germany) until Frederick the Great brought Prussia into the picture. After the Seven Years' War, Prussia had established itself as the other German power; then a bunch of things goes their way (i.e. Bismarck) that eventually led to a Prussia-dominated "Kleindeutschland" which did not include the Habsburg-ruled German realms.

So, make it so that with a divergence point no earlier than January 1 1848, the Habsburgs are the top dog in Germany, with their own German-speaking lands obviously within this framework. Note that they do NOT have to retain Bohemia or Hungary.
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