Now standing at around $39tn, decades of deficit spending have pushed borrowing to historic levels. The government is spending about $1tn a year just on interest payments. Economists warn the debt trajectory is unsustainable, with projections showing it will continue to rise.
Higher borrowing costs are already affecting Americans through mortgages and loans. There are also concerns that global investors could lose confidence in US debt markets. If that happens, it could trigger a financial crisis with far-reaching consequences. So, how serious is the risk, and can Washington bring the debt under control?