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Originally Posted by PaulC
A quote roundly attributed to George S. Patton: "Fixed fortifications are a monument to the stupidity of man." Unless we create the 21st century version of the Berlin wall, complete with armed, manned outposts, any type of fence is a waste of cash.
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As usualy the great General George S. Patton nails it again.

Although he was speaking of an attacking army. In such a case especialy with modern weapons fixed fortifications are pretty pointless. But against bare foot imigrants in a desert a wall can work well enough. Remember you don't need to stop 100% of the traffic, never will. But you certainly could stop 95%+ with a good wall.