United States
The headline debt series on the US page uses the Treasury’s Debt to the Penny total federal debt. That is not the same as debt held by the public alone.
Why use total federal debt as the headline?
It is the most defensible series the Treasury publishes every business day. It includes both debt held by the public and intragovernmental holdings (such as the Social Security trust funds), and the statutory debt ceiling set by Congress applies to this total.
How is it different from debt held by the public?
Debt held by the public is only the portion held by markets, foreign investors, and the Federal Reserve. Total federal debt adds the amount held in government accounts. So matching this number directly against a debt-held-by-the-public comparison can mislead.
Can I cite the API directly?
Yes. /api/usa/live.json and /api/usa/snapshot.json return baseAsOf, citeAs, and per-series meta.
If debt is 122% of GDP, why are Treasuries called a safe asset?
Because the dollar is the reference currency for global trade settlement and for national foreign exchange reserves. Central banks have to park reserves somewhere, and the Treasury market is effectively the only one deep and liquid enough to absorb them. That is why, again and again, demand for Treasuries rises and yields actually fall as markets grow unsettled.
This does not mean the United States is free of its debt, only that adjustment shows up through a channel other than default. Rising rates and a growing interest bill are that channel.
What is the debt ceiling?
It is a statutory cap Congress places on total federal borrowing. Once the cap is reached, further borrowing is blocked even for spending already authorised, which creates doubt not about the capacity to pay but about the willingness to pay.
For that reason a debt-ceiling standoff affects credit assessment and market sentiment regardless of accounting soundness. It is a political variable to check separately from the stock of debt.
How large is the interest burden?
What squeezes the budget before the stock does is the interest that leaves in cash each year. While rates are low, even a stock of 122% is carried at manageable interest; once maturing paper rolls over into higher rates, the interest on that same principal multiplies.
The signal of this shift is that US interest outlays have begun to be compared in size with defence or major social security spending. It is worth checking interest as a share of the budget alongside the debt ratio.