Cars and corn are among the $1m of daily trading in goods and services across the busiest land border in the world under Nafta, a deal Donald Trump has threatened to rip up. Central America correspondent Jude Webber explains.<br /><br />► Subscribe to FT.com here: http://bit.ly/2r8RJzM<br /><br />► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />For more video content from the Financial Times, visit http://www.FT.com/video<br /><br /><br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes
