"In U.S. politics, a government shutdown is a situation in which Congress fails to pass authorization for sufficient funds for government operations."
Full article on government shutdowns in the United States.
Wikipedia contributors, "Government shutdown in the United States," Wikipedia, The Free Encyclopedia, http://en.wikipedia.org/w/index.php?title=Government_shutdown_in_the_United_States&oldid=575767965 (accessed October 4, 2013).