Interesting speculation:

an open-borders America of a billion people would, in substance, be as different a polity from the polity that the United States of America is today, as the Roman Empire of the 2nd century AD was from the Roman Republic of the 3rd century BC

2020-02-22: It’s disappointing that open borders are outside the Overton window: Restrictions on immigration are the equivalent of leaving “trillion-dollar bills on the sidewalk.”

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