The Founding Fathers left one legacy not celebrated on Independence Day but which affects us all. It's the national debt.
The country first got into debt to help pay for the Revolutionary War. Growing ever since, the debt stands today at a staggering $11.5 trillion -- equivalent to over $37,000 for each and every American. And it's expanding by over $1 trillion a year.
The mountain of debt easily could become the next full-fledged economic crisis without firm action from Washington, economists of all stripes warn.
"Unless we demonstrate a strong commitment to fiscal sustainability in the longer term, we will have neither financial stability nor healthy economic growth," Federal Reserve Chairman Ben Bernanke recently told Congress.
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Higher taxes, or reduced federal benefits and services -- or a combination of both -- may be the inevitable consequences.
The debt is complicating efforts by President Obama and Congress to cope with the worst recession in decades as stimulus and bailout spending combine with lower tax revenues to widen the gap.
Interest payments on the debt alone cost $452 billion last year -- the largest federal spending category after Medicare-Medicaid, Social Security and defense. It's quickly crowding out all other government spending. And the Treasury is finding it harder to find new lenders.
The United States went into the red the first time in 1790 when it assumed $75 million in the war debts of the Continental Congress.
Alexander Hamilton, the first treasury secretary, said, "A national debt, if not excessive, will be to us a national blessing."
Since then, the nation has only been free of debt once, in 1834-1835.
The national debt has expanded during times of war and usually contracted in times of peace, while staying on a generally upward trajectory. Over the past several decades, it has climbed sharply -- except for a respite from 1998 to 2000, when there were annual budget surpluses, reflecting in large part what turned out to be an overheated economy.
The debt soared with the wars in Iraq and Afghanistan and economic stimulus spending under President George W. Bush and now Obama.
The debt gap is "something that keeps me awake at night," Obama says.
He pledged to cut the budget "deficit" roughly in half by the end of his first term. But "deficit" just means the difference between government receipts and spending in a single budget year.
This year's deficit is now estimated at about $1.85 trillion.
Deficits don't reflect holdover indebtedness from previous years. Some spending items -- such as emergency appropriations bills and receipts in the Social Security program -- aren't included, either, although they are part of the national debt.
The national debt is a broader, and more telling, way to look at the government's balance sheets than glancing at deficits.
According to the Treasury Department, which updates the number "to the penny" every few days, the national debt was $11,518,472,742,288 on Wednesday.
The overall debt is now slightly over 80 percent of the annual output of the entire U.S. economy, as measured by the gross domestic product.
By historical standards, it's not proportionately as high as during World War II, when it briefly rose to 120 percent of GDP. But it's still a huge liability.
Also, the United States is not the only nation struggling under a huge national debt. Among major countries, Japan, Italy, India, France, Germany and Canada have comparable debts as percentages of their GDPs.