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Kalmar Union ended in 1523.
No, but the flag of the kalmar union (1397-1523) are by some seen as the Scandinavian flag.
The Kalmar union is the only time when Scandinavia have been entirely united.
Norway, Denmark and Sweden.
At the time of the Kalmar union?.... (1397–1523) Or now, possibly.
Formally from 1397 to 1524, but Sweden left already in 1448.