Remember, the US Government is stuck in a deep hole of debt. The US economy has stumbled, badly. Foreign investment and loans to the US Government are pledged on one and only one thing, YOU!
The security for all loans and investments in the United States is your lifetime of work. The US Government and corporations consider you chattel, to be bartered and traded, and when need be, sent to die in wars.
Demonstrated by the S&L crisis of the 1980s and in the current bailouts, the US Government promises that YOU will be forced to work your life away to make good any bad debts by the US Government and corporations.
When the American people stand up and say "We refuse to pay", foreign nations will no longer loan money to the US Government, and foreign investors will start searching for a safer home for their wealth.
There is no freedom without the freedom to say "no."