An antifragile country is strengthened by immigration. A fragile one is weakened by it. The US still tops that list, despite everything.
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Yes. It's the open-ended randomness that does it. To curate strongly is to lose the antifragility.
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but generally driven by non-random *external* factors - eg Visigoths pushed by Ostrogoths. Even if Romans not selective, get mostly Vs
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