Why should the US allow Canada to run structural surplus and to steal American jobs?

The US Auto market shrank from 1999 to 2009 from 17M units ,to 10.5 and only recovered the peak in 2015 , further market share has shifted away from the D3 towards Germany and Korea.  So when you are tied to the anchor of the wrong product in the wrong market, you are going to lose out.

If the Auto pact were still in place we would be even worse off as Trump would be aiming straight at us.