But then Norway ended up as part of the kingdom of Denmark by coincidence. Valdemar 4. youngest daughter Margrethe was married to norwegian king Haakon 6. in 1363 and in 1370 they had their only son Oluf. In 1375 Valdemar 4. dies and Oluf is reconized as king overruling the son of Margrethes older sister. Margrethe is made regent and in 1380 Haakon 6. dies and Oluf is also made king of Norway with Margrethe as regent. Then in 1385 the swedish king dies heirless and Oluf is yet again chosen as king with Margrethe as regent.
So the Kalmar Union is instituted and last for 126 years! Great ruler, diplomat and shrewd politician Margrethe was. WI Haakon 6. had lived on after 1370 with Margrethe as his queen? Kalmar Union with Norway as the leading power? Maybe that could have held both the Danes and the Swedes in check.
As anside:
later on Norway would be in need of grain from Jutland to sustain her population as was seen in the famine of 1801 - 1815, and later during wwII. The grain trade had been there since the stone age!
But at least from sometime before 1801 Denmark and Norway had equal size population, i.e. Denmark without the dutchies and Scania.
So the norwegians had the population and the aggressivenes to become a great nation early on, but got stopped in the tracks by Margrethe and later ended in the back-yard of Europe.
Actually I think that even the Danish kings didn't fully reconize Norwegian resources, but I'm going to have a closer look at that. In combination Denmark and Norway had the resources for early civilization: timber, iron, copper, silver, agricultural produce and ability to navigate the seas. What they missed were the population surplus that went to England and got taken away from them with the Norman conquest.
Regards
arctic warrior