Nation-states came late to history, and there’s plenty of evidence to suggest they won’t make it to the end of the century

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If you’d been born 1,500 years ago in southern Europe, you’d have been convinced that the Roman empire would last forever. It had, after all, been around for 1,000 years. And yet, following a period of economic and military decline, it fell apart. By 476 CE it was gone.