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People who allude to approaches to border security requiring thousands of miles of walls and millions of troops on the border are using strawman arguments. These people havent read previous posts by myself and others on other threads, who have discussed how security could be inplemented efficiently.
The answer is technology, supplemented by intelligent use of manpower.
The answer involves hierarchical, layered security measures, involving sensors, aerial, unmanned, and satellite assets.
People who insist on spouting these stawman arguments need to step back from the keyboard for a minute, look at the marvelous piece of technology in front of them, and just imagine what could be done with technology that makes that PC seem like a windup toy.