NEW YORK - U.S. stocks ended higher after volatile trading on Tuesday that briefly sent the Dow below 20,000 for the first time in three years amid fears over the coronavirus pandemic.The 30-issue Dow Jones Industrial Average surged 1,048.86 points or 5.20 percent to end at 21,237.38. The tech-laden Nasdaq Composite Index finished at 7,334.78, up 430.19 points or 6.23 percent.In early trading, selling took the upper hand and the Dow slipped below 20,000, with the benchmark stock average having shed nearly 10,000 points since its all-time high near 30,000 on Feb. 12.After the Dow quickly rec…READ FULL ARTICLE