The forerunner of today's S&P 500 (SNPINDEX: ^GSPC) goes back to 1926, when the S&P 90 was created as a stock market index. It was changed to 500 companies in 1957, and as of this year, there's a century's worth of data to inform investors about historical trends. That small start 100 years ago preceded the worst stock market crash in U.S. history, but a century later, the index is thriving, even though it's had its ups and downs over the decades. Is there eventually going to be another down? Most certainly. Should you sell your stocks beforehand? Like most things in life, it depends. Here's what you need to know.
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