5BAT. Is border control inevitable? [proposed by Thor]

Before the 19th Cen­tu­ry few peo­ple trav­elled much, and nation states as we under­stand them hard­ly exist­ed. Now bor­ders are rigid­ly defined, tourism is com­mon, but emi­gra­tion is a strict priv­i­lege. What are viable alter­na­tives, if any, to the present pat­tern?

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