On June 23, 2015, Donald Trump announced a crucial detail of his plan for a U.S.-Mexico border wall: He was going to build it (and “very nicely”), but Mexico was going to pay for it.
This wall along the southern border of the United States — which Trump argued would keep the Mexican “rapists” and “criminals” out of the country — has since become a key component of Trump’s successful bid for the Republican presidential nomination.
Loathsome as his reasoning may be, Trump and his supporters aren’t alone in viewing a physical wall as a way to secure a given region — and they never have been. Border walls have composed an integral part of both inter- and intranational relations throughout human history. There is of course the Great Wall of China, which was built to keep out nomadic Mongols.
When the Berlin Wall fell in 1989, the world was, on its face, more united. Yet walls continue to divide populations across the globe, and since the attacks on the World Trade Center in 2001, walls have seen an increase in popularity.
Here are seven border walls you might not know about, and the ways in which they have and — more often than not — haven’t worked.