China made a “dumb move” in targeting America’s heartland with tariffs. Soybeans are a case in point. “I understood politically why they chose soybeans, but they made a dumb move,” says John Baize, a market analyst with the U.S. Soybean Export Council. The U.S. is the number one exporter of soybeans. Brazil is number two. No one comes close after that except for Argentina, which is the largest exporter of soymeal and soybean oil. Soybeans don’t fall from the sky, so China has very little mega-markets outside of the U.S. Brazil is the only one, really. And now they are...