AHC United Scandinavia

What POD's would be need for Scandinavia to be united as a single entity from the 1850's onwards?

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If you can keep the second Schleswig War small enough for Sweden-Norway to consider aiding Denmark OR manage to avert all-together, then pan-Scandinavian tendencies in all these three countries will definitely stay and maybe even grow strong enough to make unification efforts being seriously considered.

The question now is... How could one do that? Because both Prussia and Austria were interested in the Schleswig-Holstein area (since Holstein and Lauenburg were German Confederation members) after all and they are both against Danish attempts to integrate Schleswig because of the peace treaty of the First Schleswig War. If you were to change the aftermath of the First Schleswig War (1848-1851) to a situation where the Danes either lose Holstein (plus Lauenburg) or where the special status of Schleswig as an old Danish fiefdom continues (and thus could be integrated into Denmark proper), then maybe you could easily avert the Second Schleswig War, at least in my opinion.
 
Danish king marries Swedish king's eldest daughter. He (Oskar ii?) Had many daughters but no sons. If Christian (ix?) Is married to her then the Danish royal family unites Denmark, Norway, Sweden, Iceland, Greenland, and might claim part or all of Finland later. They might even have a shot at Estonia and Latvia under the wrong circumstances.

A permutation on that would be having a German Emperor marry the daughter of the Swedish king and in turn having the eldest son of that union marry Wilhelmina of the Netherlands while permitting Denmark into the North German Confederation in 1865 - something the Danish king actually proposed but Bismarck turned down. Again, under the wrong curcumstances, it may be possible to have a super-Germany running from Antwerp or Amsterdam to Tallinn with every piece of Baltic acreage save St Petersburg in German hands. Berlin would rule Northern Europe, especially if Congress Poland were integrated directly into this uber-GröBdeutscheland
 
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