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 Recession in the United States
On December 1, 2008, the National Bureau of Economic Research (NBER) declared that the United States entered a recession in December 2007, citing employment and production figures as well as the third quarter decline in GDP. The Dow Jones Industrial Average lost 679 points that same day. On January 4, 2009, Nobel Memorial Prize–winning economist Paul Krugman wrote, "This looks an awful lot like the beginning of a second Great Depression."