The Existing Border Barrier Between the U.S. and Mexico is Nearly 600 Miles long

   So...does this mean that we're already an evil "nation of walls" and all that hoo-ha?
   We've also got plenty of walls at airports and seaports stopping people from coming in until they go through the proper channels. Trump's apparently wrong (surprise!) about the value of a wall across the entire southern border...but there's nothing intrinsically anti-American about the idea, despite liberal whinging about it. It's purely a matter of cost-effectiveness.