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The average duration of the 11 recessions between 19 is 10 months, compared to 18 months for recessions between 19, and 22 months for recessions from 1854 to 1919.
No recession of the post-World War II era has come anywhere near the depth of the Great Depression, which lasted from 1929 until 1941 and was caused by the 1929 crash of the stock market and other factors.
Attempts have been made to date recessions in America beginning in 1790.
These periods of recession were not identified until the 1920s.
To construct the dates, researchers studied business annals during the period and constructed time series of the data.