re: Can the USA go into more and more debt forever?

We can't pay what we owe now without a lot of pain. Greece situation or worse. Politicians won't allow it to happen until the market forces it. The Chinese could dump government bonds and cause this at any time. They'd just have to be willing to eat the loss on the bonds they hold. Research the Russian involvement in our CMO and derivatives induced housing crash if you want to see how it can be done.