U.S. stocks were seeing a broad-based rout Thursday, led by a selloff in media, technology, consumer and financial stocks as investors wrestled with worries about a slowdown in global growth. “There is heightened uncertainty that began with yuan devaluation last week, while overall China’s growth is slowing father than thought. This is weighing on confidence,” said Randy Frederick, managing director of trading & derivatives at Schwab Center for Financial Research. The nervousness on Wall Street was apparent from a jump in the CBOE Volatility index VIX, +16.98% which has gained more than 35% to 17.65 over the past three trading...