A visualization of United States debt:
Ten Thousand Dollars
$10,000 - Enough for a great vacation or to buy a used car.
Approximately one year of work for the average human on earth.
One Million Dollars
$1,000,000 - Not as big of a pile as you thought, huh?
Still this is 92 years of work for the average human on earth.
One Billion Dollars
$1,000,000,000 - You will need some help when robbing the bank.
Now we are getting serious!
15 Trillion Dollars
$15,000,000,000,000- Unless the U.S. government fixes the budget, US national debt (credit card bill) will topple 15 trillion by Christmas 2011.
Statue of Liberty seems rather worried as United States national debt passes 20% of the entire world's combined GDP (Gross Domestic Product).
In 2011 the National Debt will exceed 100% of GDP, and venture into the 100%+ debt-to-GDP ratio that the European PIIGS have (bankrupting nations).