Your initial argument indicated that walls don't work and are to expensive. I only pointed out that history seems to refute that they work regardless of where they are deployed, and the cost savings to the taxpayers based on estimates is substantial. The cost estimates come from people guessing because nobody knows how many "undocumented immigrants " are in the country. btw the same study indicated they contribute an estimated $18b in tax revenue and other economic support. Still a no brainer. Also don't believe that proof of citizenship is required to take advantage of social programs offered in US .
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