How would Trump's Mexican wall work?

With the US President threatening to 'do what it takes' to build a wall, The Week looks abroad for inspiration

Trump touches Western Wall
US President Donald Trump visits the Western Wall in Jerusalem's Old City 
(Image credit: Mandel Ngan/AFP/Getty Images)

Donald Trump doubled down on his Mexico wall rhetoric last night, threatening to "close government" if lawmakers failed to approve funds to build a walled border across the southern US.

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