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Perforated fence (triple concertina works just fine) for visibility; right-of-way for pave two-lane down to unpaved one-lane roadway; then The Wall proper. Which should have a mono-rail track on top for mobile watchtowers that can be repositioned as needed.
A knock-on effect would be Mexico enforcing their own Southern border.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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