Border Patrol agents and others stand next to a new stretch of border wall in Calexico, Calif., Friday, Oct. 26, 2018. U.S. Department of Homeland Security Secretary Kirstjen Nielsen will later visit the new 30-foot-high border wall that is replacing a 2-mile stretch of older barriers between the U.S. and Mexico in Calexico. (AP Photo/Gregory Bull)
Everyone has heard of Donald Trump’s so-called wall (or is it a fence? Or is it solar panel farm?). Most people also know that Trump’s wall is the latest in a long line of attempts to restrict movement using physical barriers – the Great Wall of China was constructed to keep out the Mongol hordes, Hadrian’s wall was built to keep out the barbarians.
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