Rahim: If Donald Trump knew any better; he would have told you that there is already not one wall but in fact two walls on the U.S Mexico border they were built in the 1990's. It runs from San Diego, California to Loretta, Texas and they are equipped with motion detectors and cameras as well; but the smugglers cut holes through them and build tunnels under them. They have been proven ineffective for all practical purposes. The Chines built the Great Wall of China for the same purpose many centuries ago; but that too proved to be ineffective. However, the Chinese managed to recover some of the cost by marketing the wall as a tourist attraction. So good luck with the great wall of America, maybe in a few hundred years it could be marketed as a tourist attraction and as an ever lasting symbol of ethnic and racial disparity. If anything the contractors building the great American wall will hire cheap Mexican laborers to maximize their profits and create a great boondoggle for the tax payers to pay for many generations.