The Tornio/Haparanda course is the only two-nation golf course in the world, residing on the border of Finland and Sweden. Playing 18 holes means crossing the border 4 times.
Icelanders suffer from Small Nation Complex. Meaning they know they are the best Nation in the world.... Per capita of course!
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The US knew this and had deviced a counter: Nuking all Danish straits until it was impossible to sail through them.
In case of WW3, Denmark would not only have ceased to exists as a country and a people, it would have ceased to exist as a geographical features.