"From sub-prime mortgages in 2007 to the newly downgraded US debt status, the latest crisis point is unlikely to be the last. 9 August 2007. 15 September 2008. 2 April 2009. 9 May 2010. 5 August 2011. From sub-prime to downgrade, the five stages of the most serious crisis to hit the global economy since the Great Depression can be found in those dates." (Quoted from article)