Long Depression
In the United States, the Long Depression began with the Panic of 1873. The National Bureau of Economic Research dates the contraction following the panic as lasting from October 1873 to March 1879. At 65 months, it is the longest-lasting contraction identified by the NBER, eclipsing the Great Depression's 43 months of contraction. Figures from Milton Friedman and Anna Schwartz show net national product increased 3 percent per year from 1869 to 1879 and real national product grew at 6.8 percent per year during that time frame. However, since between 1869 and 1879 the population of the United States increased by over 17.5 percent, per capita NNP growth was lower. Following the end of the episode in 1879, the U.S. economy would remain unstable, experiencing recessions for 114 of the 253 months until January 1901.
Economic collapse
While arguably not a true economic collapse, the decade of the 1930s witnessed the most severe worldwide economic contraction since the start of the Industrial Revolution. In the US, the Depression began in the summer of 1929, soon followed by the stock market crash of October 1929. American stock prices continued to decline in fits and starts until they hit bottom in July 1932. In the first quarter of 1933, the banking system broke down: asset prices had collapsed, bank lending had largely ceased, a quarter of the American work force was unemployed, and real GDP per capita in 1933 was 29% below its 1929 value. The ensuing rapid recovery was interrupted by a major recession in 1937-38. The USA fully recovered by 1941, the eve of its entry in World War II, which gave rise to a boom as dramatic as the Depression that preceded it.