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If the border was only 75 miles, it could make some sense to at least put up something to restrict the easy access.
But the border is 2000 miles long.
If you were to build such a thing, sucessfully, and make it rat proof (tunnel), you would have a new fight on your hands on water and coastal areas.
It's a no win situation.
You can only manage it to some extent.
The 2 lager factors you need to deal with is why are they leaving where they are and why is it attractive to come here.
Attack it at those 2 sources.
This is as bad as the war on drugs. Can't win playing it this way.
You just spend lots of money where that in itself becomes a corruptible problem.
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