If they do build the wall they will need to build roads. One of the biggest reasons business moves to Mexico is that they don't need to deal with ports. They are our neighbors. One of the biggest problems is that there are not enough roads and gates. What if the wall and the new roads solves that problem and more business moves to Mexico? They may even pay for the wall if it's good for business.

I'll bet Trump figured that out a long time ago.

Do you see how they manufacture in China? Everyone lives together at the factory site. That's cheaper than robots for them. Is that how they manufacture in Mexico?