
Over 90% of all gunpowder fired by the Americans during the American Revolution was supplied by France.
Several countries have in the past banned ruling queens, but lacked any requirement that the king be male. This led to King Anna of Poland, and King Mary of Hungary.
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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.