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How could you get Bavaria to be part of the Austrian Empire under the Habsburgs instead of Hungary by 1600 and hold it to the 20th century (its fine if it joins as a kingdom of greater Germany under the Hasburgs by then)?
From the below map Duchy of Bavaria, Nordgau, Bohemia, Moravia, Istrian March, March of Verona, and the three green stripped Austrian Marches.