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> You generally need borders if you want some from of universal heath coverage for example, that's not disputed.

Do you mean that the US can't afford to give universal heath coverage to everyone if the entire world migrated in or is there another reason?

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> Do you mean that the US can't afford to give universal heath coverage to everyone if the entire world migrated in

Pretty much. I doubt much of Europe, who already do have universal coverage, would migrate, but there would still probably be too much migration at once to handle with an open borders policy if you wanted to give everyone coming in the same quality of care, (which of course you would).

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