U.S. stocks fell sharply on Sept. 3 as weak manufacturing reports and a decline in construction spending fanned fears of an economic slowdown. According to preliminary data at market close, the benchmark S&P 500 lost 118.64 points, or 2.10 percent, to end at 5,529.76 points, while the Nasdaq lost 576.06 points, or 3.25 percent, to …