Talk about a picture worth a thousand words. The nearby graph, from USDA's February 2015 report "China's Growing Demand For Agricultural Imports" (http://tiny.cc/…), tells the story of the evolving U.S.-China ag-trade relationship.
In the 1990s, we learn, both exports and imports were minimal -- generally less than $2.5 billion a year -- and fairly balanced. In one of the years -- 1993 -- the U.S. actually ran a tiny ag-trade deficit with China.
In the new millennium, ag exports to China have increased ten times while imports have merely tripled.
Further on in the same report we learn ...