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Make Denmark keep Holstein-Lauenburg and Scania to this date.
How to do it i am not sure. For Holstein maybe if Denmark din not break The November Constitution.
that would not trigger the Second Schleswig War, and Denmark could keep Holstein?
For Scania, i have no idea other than it was along time ago a part of the Danish realm.
Maybe let Denmark win some of the wars it had with Sweden
This will of course make Denmark bigger, and Sweden will loose some of it population.