U.S. President Donald Trump talked tough against Mexico. Then he essentially agreed to renew the existing trade deal and called that a victory. If only the China spat could end the same way. It won't.

That's because the gulf between Beijing and Washington is not just caused by recent rhetoric and tariffs. It also goes beyond national security concerns. The inevitable clash stems from how the American and Chinese economies have evolved over decades.

Relative to China, Mexico hasn't shifted much. It has been and remains mortgaged commercially, diplomatically and culturally to its northern neighbor.