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.
Great Depression in the United States
The New Deal was, and still is, sharply debated. The business community, with considerable support from such conservative Democrats as Al Smith, launched a crusade against the New Deal, warning that a dangerous man had seized control of the economy and threatened America's conservative traditions. Scholars remain divided as well. When asked whether "as a whole, government policies of the New Deal served to lengthen and deepen the Great Depression," 74% of American university professors specializing in economic history disagreed, 21% agreed with provisos, and 6% fully agreed. Among respondents who taught or studied economic theory, 51% disagreed, 22% agreed with provisos, and 22% fully agreed.