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> That's been the common law since King Tut.

Much immigration law is pure statute and dates from the 20th century. Border enforcement has varied hugely, and often included internal border and migration enforcement.

(The British Empire had almost what we would call EU-style "free movement" exactly up to the point where nonwhite people started taking advantage of it in significant numbers, with the Ugandan Asians fleeing Idi Amin in the 60s.)

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