Deflation
Deflation occurred periodically in the U.S. during the 19th century (the most important exception was during the Civil War). This deflation was at times caused by technological progress that created significant economic growth, but at other times it was triggered by financial crises — notably the Panic of 1837 which caused deflation through 1844, and the Panic of 1873 which triggered the Long Depression that lasted until 1879. These deflationary periods preceded the establishment of the U.S. Federal Reserve System and its active management of monetary matters. Episodes of deflation have been rare and brief since the Federal Reserve was created (a notable exception being the Great Depression) while U.S. economic progress has been unprecedented.
Economic history of the United States
Following the stock market crash, the worldwide economy plunged into the Great Depression. The U.S. money supply began to contract by one-third. The protectionist Smoot–Hawley Tariff Act incited retaliation by Canada, Britain, Germany and other trading partners. Congress, in 1932, worried about the rapidly growing deficit and national debt, and raised income tax rates. Economists generally agree that these measures deepened an already serious crisis. By 1932, the unemployment rate was 25%. Conditions were worse in heavy industry, lumbering, export agriculture (cotton, wheat, tobacco), and mining. Conditions were not quite as bad in white collar sectors and in light manufacturing.