The document discusses the national debt of the United States, including its current size of over $9 trillion as of 2007, who it is owed to, historical trends, and potential impacts. It notes that total debt obligations including programs like Social Security and Medicare exceed $53 trillion. Much of the debt is held by the public and foreign governments, with foreign holdings increasing in recent years. Rising costs of programs and an aging population threaten to increase the debt to unsustainable levels if not addressed.