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In the treaty of Kiel that ended the was between Denmark-Norway and Sweden (as well as Great Britain) Denmark was forced to cede Norway to Sweden in exchange for Swedish Pomerania. Denmark kept possession of the Faeroe Islands and Greenland during this exchange. But is their anyway that Denmark as a whole could be either annexed for put into a political union with Sweden and Norway?
What effects would this have as time-went on if this union was kept alive? Could it have survived under one ruler?