Why building a Mexico-US border wall is impossible

A couple of videos here about why the nearly 2000 miles along the US-Mexico border is already pretty safe and why the talk of building a wall between the two countries is actually quite impossible to do. There are privately held lands, different terrains, and an insane cost to building a wall that won't necessarily do any better than current border patrols on their daily routes.

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Look at this zipline in The Catskills

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Ron Parida's Apple rant from January 2016 still rings true today