U.S. stocks tumbled on their worst day in nearly two months. The fall came on the 20-year anniversary of the 1987 stock market crash. A warning from Caterpillar is being blamed for the fall. The Dow fell by 366 points and the Nasdaq tumbled 74 points. Here's a video from Reuters looking back atBlack Monday on October 19, 1987 when stocks fell nearly 23% in a single session.
