Wall Street‘s main indexes opened sharply higher on Monday as the United States and China reached a deal to reduce tariffs, signaling a truce in a punishing trade war that had kept markets on edge for weeks.The Dow Jones rose by 1,024.42 points or 2.48% to 42,273.80, the S&P 500 gained 146.62 points or 2.59% to 5,806.53, and the Nasdaq advanced 618.59 points or 3.45% to 18,547.51.