What’s the most multinational state? Not as in including a lot of component nations, but as in most open borders and most liberal rules around dual citizenship, offshore finances/taxes, residency etc?
Seems like Portugal and Canada are top contenders. Any in the global south?
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I'm curious what drives this. I would naively expect higher per-capita wealth to do it, in that open borders are more useful for the rich. Monaco, Liechtenstein, Luxembourg , Singapore, and Ireland top that list:

