Why did the Kalmar Union and Denmark-Norway Collapse?

Why did the Kalmar Union and Denmark-Norway Collapse?
Despite each having their own cultures and people, and now being entirely independent of each other, the three Nordic nations, in particular, have a curiously intertwined history. But why exactly did they end up united? What happened to the Kalmar Union that would eventually be succeeded by Denmark-Norway? And why would Denmark-Norway eventually collapse?...
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