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Continue to ChatWalls are very important when you`re separating two urban areas where if you`re actually able to get over the border you can probably get into the underground network in about 30 seconds. But when you`re out in the middle of the desert, it makes no sense because you have border security people have up to a day to apprehend people who are crossing illegally. - John Yarmuth from https://whatsmyquote.com/quote/walls-are-very-important-when-you-re-separating-two-urban-areas-where-if-you-re-actually-able-to-get-over-the