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    $\begingroup$ Except that you need resources and you can't pull them out of thin air (it's the same problem that "floating island" nations face); you'd need a novel economic model to sustain your country. $\endgroup$ Commented Feb 16, 2018 at 14:04
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    $\begingroup$ @LSerni So you do it in reverse: go down and put that concrete a km below your country so it requires less surface area. $\endgroup$ Commented Feb 16, 2018 at 17:06