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Sweden has for political and dynastic reasons been in union with other kingdoms and princely states, ostensibly personal unions.
In 1319 the infant Magnus Eriksson was crowned as king of both Sweden and Norway. The union lasted until 1343 when Magnus preemtively let his son Haakon, succeed him to the Norwegian throne. The Swedish kingdom at this time included Sweden and Finland, while the Norwegian kingdom included Greenland, Iceland, the Faroe, Shetland and Orkney Islands.
Main article: Kalmar Union
In 1397 the three Scandinavian kingdoms of Sweden, Norway and Denmark were united in the Kalmar Union, a personal union agreed upon in the Swedish city of Kalmar. After only a few decades the relationship between Sweden and the leading power Denmark had deteriorated into open conflict. The period until the dissolution in 1521 was marked by the constant strife between Sweden and Denmark. The union was sometimes made defunct by Sweden electing a monarch separate from the union king, and on one occasion Sweden and Norway were even de facto united in a personal union in opposition to the union monarch.
In 1592 Sigismund succeeded his father John III of Sweden to the Swedish throne, but in 1587 he had also been elected king of Poland-Lithuania making him the monarch of both nations. Sigismund, who was a catholic failed however to gain support in protestant Sweden, and was eventually deposed and succeeded by his uncle Charles IX in Sweden 1599.
In 1654 the reigning queen Christina of Sweden abdicated and was succeeded by her cousin Charles, duke of Pfalz-Zweibrücken. Sweden and Zweibrücken was united also under Charles XI and Charles XII, until the death of the latter one in 1718, at which point he was succeded by his sister Ulrike Eleonora on the Swedish throne, but not in his German Duchy.
Frederick I of Sweden had acceded to the Swedish throne when his wife, Ulrike Eleonora in 1721, abdicated in his favour. In 1730 he was also in line of succession to the duchy of Hesse-Kassel, which resulted in a personal union that lasted until the death of Frederick in 1751.
Main article: Sweden-Norway
By the Treaty of Kiel in 1814 Denmark ceded Norway to Sweden, an event which likely would have resulted in a full political union between Sweden and Norway. The treaty however never came into force, but Norway had as an indirect effect of it gained its independence from Denmark. Sweden, which would not accept this outcome was able to pressure Norway into accepting a personal union with Sweden. Norway had full inner autonomy, but depended on Swedish foreign policy and a Swedish monarch, even if the new Bernadotte dynasty could just as well be termed Norwegian, until the dissolution of the union in 1905.
Sweden has been a part of the European Union since 1995.
| Year | Unions | Lasted | |
|---|---|---|---|
| — | Sweden | – | Centuries |
| 1319 | Norway | 24 years | |
| 1343 | – | 54 years | |
| 1397 | Denmark and Norway | 124 years | |
| 1521 | – | 71 years | |
| 1592 | Poland-Lithuania | 7 years | |
| 1599 | – | 55 years | |
| 1654 | Pfalz-Zweibrücken | 64 years | |
| 1718 | – | 12 years | |
| 1730 | Hesse-Kassel | 21 years | |
| 1751 | – | 63 years | |
| 1814 | Norway | 91 years | |
| 1905 | – | A century | |