Steel walls, fences and razor wire form the imposing U.S.-Mexico border wall in San Ysidro, California.
In this presidential election year, much of the focus has been on national security, and one idea that has come up repeatedly is that walls can be built along the U.S. border with Mexico to keep contraband and people from crossing illegally. This suggestion ignores the reality that powerful and basic economic forces make it simply impossible to hermetically seal the U.S.-Mexico border....
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