Comments by "No Fate But What We Make" (@SonoftheAllfather) on "Trump Pitches Solar-Panel Topped Border Wall System" video.

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  15. @ neil: It seems like an archaic practice to build walls, sure, but over 29 border walls have been planned, proposed, or built all over the world since 2000. There are 65 operating border walls in the world. Certainly all these countries have critically assessed the effectiveness and concluded they aren't an unnecessary waste of money and resources. I think the main difference between ancient and modern border walls is fairly obvious. Ancient walls were built to hinder, delay or thwart invading armies and raiding parties, as well as "mount detection devices (human surveillance)" as you said. Modern walls need only to hinder, delay or thwart the much less formidable and motivated common migrant. The exception being walls in places like Israel and the late great Berlin Wall. I also added earlier in this thread that physical barriers are used everywhere to designate boundaries and private property, not just national borders. It adds a psychological factor that implies "keep out," especially when concertina wire is used. Although it sounds simplistic, even walls that are easily defeated usually thwart human traffic to a significant degree. Apartment complexes, industrial yards, port facilities, government facilities, military bases, etc. all invest in physical barriers. I don't know how feasible a purely "detect and react" system would be, and in all actuality, we have plenty of detection and reaction capabilities that could be easily employed right now, but are not. I think solar powered drone systems could be used for detection and alerting reaction forces. This in conjunction with a physical barrier would be highly effective, in my opinion.
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