Fully agree with Chengar.
The 1864 defeat had totally removed any sense of even revenge.
Even up until 1920 and the re-union with pieces of Schleswig back to Denmark, the Danish government was reluctant to even try to grab all the "lost" land from 1864. I read somewhere (to be confirmed though) that the british govenment was stasrting to get a bit impatient with Denmark in terms of where the border should be.
Denmark managed to stick to the vote of the concerned populations; hence the current border, despite the fact that Germany had tried to settle german speaking people to swing the vote.
Even in my childhood, havbing been born 70 km frm the border, travelling south, passing the border, people would still be speaking Danish, surnames like Petersen, Olsen, hansen, etc, etc. until you cross the "real" border some km further south. Then you would be in Germany: Stein, Horst, Fritz, etc, etc.
But Denmark had no appetite for getting people on-board just for the hell of it, knowing it would just cause problems later.
Just a note,
Ivan