Mr Know-it-all you might want to write Moët et Chandon and let them know that they have been misprinting their labels since 1936:

http://www.lvmh.com/images/left/2006DomPerignon-Vintage98-L.jpg

The chances of something like this happening are pretty darn slim. First as many others have said if it ever gets that far the bible/old confederate belt would stick together, with the exception of perhaps Florida and Texas.

But more importantly preceding any collapse you are likely going to see some of the states that can exist on their own (New York/New Jersey, Texas, Florida, California) breaking away . From that, as those states typically contribute far in excess to what they receive in addition to the turbulence and insecurity shutting off the tap on foreign investment through T-Bills triggering a huge spending crunch. Since we would be talking about halving the budget. From there either endless bickering over what is left would tear the country apart many joining the states that left, others splitting off into two or so groups. AK and HI would likely be left out to dry as they are too far away and too expensive to upkeep, or the group of states will stick it out until the foreign investment returns and the states and fed cut the fat to live sans some key states.