All three of the major indices on Wall Street fell on Thursday after the Chinese stock market dropped nearly three-percent to hit a four-year low. <br /> The Dow Jones Industrial Average tumbled by more than three-hundred points, or around one-point-three percent.<br />The S&P 500 dropped over one-point-four percent, and the Nasdaq fell more than two percent. <br />This comes after China's Shanghai Composite index reached its lowest level in four years... and investors are worried this might lead to a global economic slowdown.<br />Analysts are saying the ongoing trade spat between the U.S. and China also contributed to the fall. <br />