As President Donald Trump and Chinese leader Xi Jinping prepare to meet Thursday, one soft-spoken U.S. export star will take center stage: soybeans. The humble crop, a $30 billion pillar of U.S. agriculture exports, has become a powerful symbol of the economic interdependence and political tension between Washington and Beijing. In short, soybeans have come to embody the volatility of the U.S.–China trade war. Beijing halted purchases of American soybeans on the heels of retaliatory...










