Border walls and dykes are quite an ancient concept. Yours. Ours. Keep out. http... | Hacker News

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ahazred8ta 9 months ago | parent | context | favorite | on: Stone Age settlement found under the sea in Denmar...

Border walls and dykes are quite an ancient concept. Yours. Ours. Keep out.

https://en.wikipedia.org/wiki/Sasanian_defense_lines -- https://en.wikipedia.org/wiki/Limes_(Roman_Empire)

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