America has defaulted on it's debt before. To understand the creation of money and it's impact on society you should go watch Secret of Oz by Bill Stills. Bill Stills has another document called The Money Masters which also is a good watch. Bill is definitely a paperbug versus a bullionbug and he makes very valid points as to why we need paper money versus a gold standard. Anyways, anyone who says America hasn't defaulted on it's debt is a liar, we've defaulted twice so far and definitely on track for a third time.
Had a quick look at the money masters, which I think Bill produced? Below is a quote from the site.
1. Directs the Treasury Department to issue U.S. Notes (like Lincoln’s Greenbacks; can also be in electronic deposit format) to pay off the National debt.
2. Increases the reserve ratio private banks are required to maintain from 10% to 100%, thereby terminating their ability to create money, while simultaneously absorbing the funds created to retire the national debt.
http://www.themoneymasters.com/This is exactly what should happen in America. The first point would end this perpetual 'debt' non-issue that occurs periodically.
America has defaulted on its debt, but the circumstances were significantly different. Today America issues its own money backed by nothing more than the faith of the people. The first time America defaulted in 1779, the U.S dollar was backed by the Spanish Dollar. This is exactly the same as the Greek situation today, where America has to source Spanish Dollars to service it's currency. The default of 1862 is similar, except instead of the currency backed by Spanish Dollars it was backed by Gold. Once again this is similar to Greece, America must source Gold to produce Dollars. So when America couldn't source enough Spanish Dollars or Gold, obviously this is the definition of default. This is the same situation that Greece faces.
However, since America has gone off the Gold Standard, the creation of the Dollar is no longer constrained by the amount of gold available. The American debt created today is denominated in U.S dollars and since America is the issuer of its own currency then there will always be enough U.S dollars to pay back the debt. Therefore as long as America remains the issuer of its own currency, which I'm sure she will, and backed by nothing more than the faith of the people, America can not default on its debts.