US stocks move broadly higher; Dow jumps over 400 points

Stocks marched sharply higher on Wall Street in afternoon trading Tuesday after the head of the Federal Reserve signaled that the central bank is prepared to cut interest rates to sustain U.S. economic growth.Fresh optimism about the possibility that the U.S. and Mexico will swiftly reach a trade deal also helped lift the market.Technology stocks led the broad rally, which sent the Dow Jones Industrial Average more than 400 points higher and had the S&P 500 on track for its best day since ea