With the POD in 1866 you could have Denmark part of Germany. After the defeat in the Danish-German war king Christian IX offered Bismarck and Wilhelm I to join the German Bund and become a vassal of Prussia if he could maintain territorial integrity.
Even if there wasn't a Danish revolution in 1864 it seems to me that the King Christian would rebel against Prussia at the first opportunity, i.e. the Austro-Prussian War, by taking the side of the Austrians. If the Danish Army had reinforced Austria's north German allies it might have tipped the scales in Austria's favour.Yes, he probably acted so in order to keep his throne in some way or another, but he probably would have had serious trouble to have the Danes follow him. Would make Denmark a republic at first given instance and a very unruly place until then.
But anyway I think a Kaiserreich not bled pale by war (WWI) most likely will develop into a constitutional monarchy led by mainly social democratic PMs. Kind of Sweden on steroids.
Next Europe will conquered through exports of industrial products - not unlike OTL until Merkel ruined it all.
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