Why did Denmark gain land after WW1 despite being neutral?
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What I meant is a world without any barriers whatsoever for the circulation of people. Each country would have border checks for things like explosives, heavy drugs, and weapons, but apart from that everyone would be allowed in, always. I'm not sure about economy measures, trade barriers, and circulation of goods, though.
But please, feel free to interpret "world without borders" however you wish! ;)