Today I have a two-page article in Aftenposten, Norway’s largest newspaper, about the secundogeniture idea in the second Swedish-Norwegian union, i.e. the idea that the personal union could be dissolved by the Crown Prince inheriting the crown of Sweden while a younger prince became King of Norway.
There are plenty of examples of secundogeniture solutions being used to dissolve unions or keep countries apart (for instance Austria and Tuscany) and it was also through secundogeniture that the first Swedish-Norwegian union was dissolved in 1343.
The idea was mentioned in the 1880s, but gained momentum from 1897 and had supporters in high places, possibly including members of the royal family, but did not come to fruition before the Norwegian Parliament unilaterally declared the union dissolved on 7 June 1905. However, there are certain indications that the idea might have succeeded if the union had been dissolved through bilateral negotiations.