There is no logistical way to build an effective wall between the US and Mexico. The terrain is too difficult, the cost too great, and the ways around it too many. For one thing, 40 percent of all people in the country illegally come by plane and overstay one of a variety of visas.41 Walls can’t just be built and left to do their thing. They must be staffed and maintained. Any wall can be breached, climbed over, or tunneled under if no one is watching. That would require a vast army along the fence, which would undoubtedly contribute to more unnecessary deaths. More than 700 border tunnels
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