Michael Haverty believes the future of international trade hangs on a dusty Mexican port town. You take a bumpy ride on a potholed gravel road through a fishing village to a grassy riverbank to get to the most important new shipping terminal in North America. There's nothing here yet, except birds and the blue Pacific. One mile to the south you can see the old terminal, where three cranes idly wait for a few cargo ships to pull in. It's so quiet you can hear the tilapia jumping out of the water. But when Michael Haverty stands here, at the...