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How could we create a Austrian empire which had at least 75% German speaking population.
It need to own at least the Kingdom of Hungary, Transsylvania and Croatia.
It may not include more of Germany than pre Napoleon Wars Bavaria and Silesia (and of course Austria and Czechia).
Bonus points
If it have a post 1700 POD.
It doesn't include Bavaria and/or Silesia.
If it include other areas outside the HRE.
Minus point
If it include genocide
If it include ethnic cleansing of linguistic groups.