<P> Major modern economic statistics , such as unemployment and GDP , were not compiled on a regular and standardized basis until after World War II . The average duration of the 11 recessions between 1945 and 2001 is 10 months , compared to 18 months for recessions between 1919 and 1945 , and 22 months for recessions from 1854 to 1919 . Because of the great changes in the economy over the centuries , it is difficult to compare the severity of modern recessions to early recessions . 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 . </P>
<P> Major modern economic statistics , such as unemployment and GDP , were not compiled on a regular and standardized basis until after World War II . The average duration of the 11 recessions between 1945 and 2001 is 10 months , compared to 18 months for recessions between 1919 and 1945 , and 22 months for recessions from 1854 to 1919 . Because of the great changes in the economy over the centuries , it is difficult to compare the severity of modern recessions to early recessions . 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 . </P>
when was the longest recorded recession in us economic history
when was the longest recorded recession in us economic history
1929 until 1941
1929 until 1941