The third and last great union of 1958. Norway's king had died without a suitable heir a few years prior, and serious consideration was given to making the country a republic. As a result, the proposal was made in both Sweden and Norway to revive their grand union. The status of Denmark was also uncertain, as its Hohenzollern monarchy installed after WW1 was deeply unpopular. The parliaments of these three countries convened in secret, and voted together. The result was the Kalmar Union Plan, which would unite these three countries under a common economic, diplomatic and military umbrella, stiffening their resistance against the influence of the world's superpowers. One of the most controversial points was NATO; both Norway and Denmark were part of this alliance, but Sweden was staunchly neutral. In the end it was decided that the newly born Scandinavia would be a part of NATO; Sweden's large frontier with communist Finland could not simply be ignored. In November 24th of 1958, Gustaf VI Adolf of Sweden was crowned as King of the Norwegians, Swedes, Danes, and of Scandinavia, creating a northern bulwark of western democracy.