Did you know? The worst market crash in the United States lasted two years (1930-1932) and helped spawn the Great Depression. A thousand dollars invested in September 1929 was worth just $108.14 in July 1932. In the three years following the stock market crash, the S&P 500 fell 86%. It wouldn't recover to its previous peak for another 32 years.
McManus, Lori. Money through History (Understanding Money). Chicago, IL: Heinemann Library, 2012.