U.S.-China economic ties have expanded substantially over the past three decades. Total U.S.- China trade rose from $2 billion in 1979 to $562 billion in 2013. China is currently the United States' second-largest trading partner, its third-largest export market, and its biggest source of imports. China is estimated to be a $300 billion market for U.S. firms (based on U.S. exports to China and sales by U.S.-invested firms in China). Many U.S. firms...