It is impossible to state the exact date when Nordic cooperation began. Cooperation has been developing over several centuries, it has assumed different forms and has reinforced the common Nordic identity. Some events and phases merit closer attention:

1397-1521: The Kalmar Union
The Kalmar Union was a union of three Nordic kingdoms formed in 1389, when Queen Margrethe – already regent in Norway and Denmark – was elected regent in Sweden.

1523 – 300 years ahead: A divided Nordic region
The question of Yes or No to the Nordic union became relevant when Gustavus Vasa was elected king of Sweden. Tensions exploded between the countries and the Nordic region was split. Sweden and Finland formed one alliance, while Denmark, Norway, Iceland, Greenland and the Faroe Islands formed a counter alliance. Finally, the confrontations triggered the Great Northern War in the early part of the 18th century.
This was an era of wars and disorder, when the lines of authority often changed.

1830-1860: Scandinavism
Scandinavism is the term used as a designation for the sense of solidarity shared by the people of the Nordic region, and for all activities designed to promote cooperation between people or to unite them on the political level.

1815-1905: Union between Sweden and Norway
After a few months of independence Norway abandoned the union with Denmark in favour of a new union with Sweden. However, the Norwegians felt a growing desire to achieve independence soon. In 1905 Norway became independent and Haakon VII ascended to the throne.

1873-1914: Currency Union
Increased trade encouraged Denmark, Norway and Sweden to introduce a Nordic currency – the krone.

1952: Nordic Council
The formation of the council made it possible for Nordic parliamentarians to play a larger role in the process of developing cooperation on legislation.

1971: Nordic Council of Ministers
The Council of Ministers was to serve as the official joint cooperation body for the Nordic governments. Each country appoints its own minister for cooperation.