The dissolution of the union (Bokmål: unionsoppløsningen; Nynorsk: unionsoppløysinga; Landsmål: unionsuppløysingi; Swedish: unionsupplösningen) between the kingdoms of Norway and Sweden under the House of Bernadotte, was set in motion by a resolution of the Storting on 7 June 1905.
Following some months of tension and fear of an outbreak of war between the neighbouring kingdoms (then in personal union) – and a Norwegian plebiscite held on 13 August which overwhelmingly backed dissolution – negotiations between the two governments led to Sweden's recognition of Norway as an independent constitutional monarchy on 26 October 1905.
When free trade between the two countries was restricted in 1895 by the abolition of the "Interstate laws" (Mellomrikslovene), the economic reasons for the continued union were also diminished.
Second, there was also criticism that the existing network of consulates in Europe prioritised Swedish interests over Norwegian trade (thus delaying the modernisation of the tonnage tax despite cross-political agreement in Norway for such changes).
In turn, Michelsen and his ministers refused to countersign Oscar's decision and returned to Christiania on 7 June 1905, triggering a constitutional crisis.
Later that day, the Storting voted unanimously to dissolve the union with Sweden, taking the line that Oscar had effectively abandoned his role as King of Norway by refusing to appoint a replacement government.
The text of the unanimous declaration, remarkable for the fact that the declaration of the dissolution was an aside to the main clause, read: Since all the members of the cabinet have resigned their positions; since His Majesty the King has declared his inability to obtain for the country a new government; and since the constitutional monarchy has ceased to exist, the Storting hereby authorizes the cabinet that resigned today to exercise the powers held by the King in accordance with the Constitution of Norway and relevant laws – with the amendments necessitated by the dissolution of the union with Sweden under one King, resulting from the fact that the King no longer functions as a Norwegian King.Initially reacting to this declaration as a rebellious act, the Swedish government indicated an openness to a negotiated end to the union, insisting among other things on a Norwegian plebiscite.
In the early years of the 20th century, the head of the Swedish Social Democrats, Hjalmar Branting, led his party in opposing a war to keep Norway united with Sweden.
Polar explorer Fridtjof Nansen weighed in heavily for dissolving the union, and personally traveled to the United Kingdom, where he successfully lobbied for British support for Norway's independence movement.
Even as the negotiations made progress, military forces, though separated by 2 kilometers, were quietly deployed on both sides of the border between Sweden and Norway.
In its resolution of 7 June, the Storting had made what is called the "Bernadotte Offer", which invited King Oscar II to allow one of his younger sons to assume the Norwegian throne.
The offer was at one level an attempt by the Norwegian government to demonstrate goodwill towards Sweden and its royal house, notwithstanding the separation of the two countries.
At another, more significant level, it was also intended to reassure the other European powers that the secession of Norway was not a radical revolutionary project, despite the influence of socialists.
In this way, Norway aimed to gather support from the other large European countries which, with the exception of France, were all hereditary monarchies.
Five socialists in the Parliament voted against the idea of having a monarchy, and the Finance Minister Gunnar Knudsen, a republican member of the Cabinet, resigned over this issue.
Prince Carl was related on his father's side to medieval Norwegian kings, providing a link to Norway's past history.
Another advantage was that Prince Carl was already the father of a son, the two-year-old Alexander, ensuring that a successor would be in position to continue the line.
Prince Carl impressed the delegation in many ways, not the least because of his sensitivity to the liberal and democratic movements that had led to Norway's independence.
Although Sweden's close relationship with Germany did not last long, Norway's independence immediately put it inside the British sphere of influence.