Dow down 416 pts! - Why?

The Dow Jones Industrial Average went down 416 points on Tuesday, in relation to what happened to the Chinese Stock Market. I believe that the Chinese Stock market decline affected our Stock Market tremendously. This decline on the stock market created a hectic environment among stockholders because they know if the stock market is going down, they are losing money. The Chinese Stock Market was drastically increasing at one point, but on Tuesday Feb. 27 it went down by 9 percent. A lot of people decide to sell their stocks, and so making the stock market decline. Many people were concerned that the U.S. stock market was stumbling due to the overinflated Chinese stocks. China and the United States are closely linked because they are trade partners, so if something happens to Chinese economy, something is going to happen to our economy. The Dow Jones also went down due to a computer malfunction that slowed down the records of trade. This is the worst decline since after the terrorist attacks back in September of 2001.
This is definitely not as worst as the Great Depression, and I think that to many this might benefit them.