The U.S. Debt Machine: Can the World Keep Financing America?

The U.S. Debt Machine: Can the World Keep Financing America?

By Mike Nkosi | Wolf Street Economics
Serious Economics. No Hype. Just Signals.

Introduction: Borrowing on an Industrial Scale

In the time it takes you to read this sentence, the United States will have borrowed another $100,000. With a national debt exceeding $35 trillion and growing by the second, the U.S. government has become the largest borrower in human history. And yet, global investors still line up to lend.

For now.

This article unpacks how America’s debt machine functions, why the world continues to fund it, and what happens if that trust begins to fray.

How the Debt Machine Works

U.S. government debt falls into two categories:

  1. Intragovernmental holdings – money the government owes to itself, mainly for Social Security and federal pensions.
  2. Publicly held debt – this is the critical piece. It's over $27 trillion, financed by issuing Treasury securities on the open market.

These Treasuries are bought by a range of actors:

  • U.S. financial institutions
  • The Federal Reserve
  • Pension and insurance funds
  • Foreign governments and investors

As of 2025, foreign creditors hold more than $7.6 trillion in U.S. Treasuries. That includes Japan, China, the United Kingdom, Luxembourg, and various oil-exporting nations. For decades, they’ve played a vital role in keeping the debt machine running smoothly.

Why the World Keeps Buying

Despite America’s ballooning debt, demand for Treasuries remains strong. Why?

1. Liquidity

Treasuries are the most liquid financial asset on earth. Investors can buy or sell them in massive volumes with minimal risk of slippage. This makes them highly attractive to central banks managing large reserves.

2. Dollar Dominance

The U.S. dollar still accounts for nearly 60% of global foreign exchange reserves and dominates international trade. Holding Treasuries is, in effect, holding dollars with yield. This is especially true for countries like Saudi Arabia or Japan, whose export surpluses are invoiced in dollars.

3. Safe Haven Status

Despite fiscal dysfunction and political polarization, U.S. debt remains the world’s ultimate "safe asset." During crises, demand for Treasuries tends to rise, not fall—a paradox that has, so far, protected the U.S. from the typical consequences of over-borrowing.

The Rising Cost of Confidence

But this confidence comes at a steep and growing cost.

In 2024, U.S. interest payments surpassed $1 trillion for the first time—more than the annual defense budget. In 2025, that figure is expected to climb even higher. In fact, interest payments are now the fastest-growing category of federal expenditure.

This is the beginning of a fiscal feedback loop:

Borrow → Pay interest → Borrow more → Higher interest costs → Repeat.

In macroeconomic terms, this is a debt spiral. As long as interest rates stay elevated and the deficit remains high, the cost of maintaining America’s debt load will grow exponentially.

Signals from Abroad: Foreign Buyers Are Shifting

While total foreign ownership of U.S. debt remains large, a subtle shift is underway.

China, once the second-largest holder, has steadily trimmed its U.S. debt holdings to under $800 billion—a 15-year low. This is partly a response to rising geopolitical tensions and partly a move toward financial diversification.

Russia, following sanctions, has exited U.S. assets almost entirely.

Japan, the single largest holder, is now reallocating as domestic yields rise and its aging population demands more local investment.

Gulf states are using oil revenues to buy gold, Chinese bonds, and other non-dollar-denominated assets. Their Sovereign Wealth Funds are no longer defaulting to Treasuries.

These shifts are gradual—but significant. The “buyer of last resort” dynamic that once defined U.S. debt markets is eroding. America is no longer the only game in town.

Can This Be Sustained?

Technically, yes. As long as U.S. Treasuries remain the anchor of the global financial system, there will be demand.

But if trust in the dollar weakens, or if an alternative financial architecture begins to coalesce—perhaps through BRICS+, a digital yuan settlement system, or commodity-backed currencies—then demand for Treasuries could weaken.

And if that happens, the consequences are serious:

  • Rising interest rates
  • Crowding out of domestic investment
  • Higher taxes or austerity
  • Reduced capacity for military and welfare spending

Debt is a form of economic power. But too much debt—especially when underwritten by foreign capital—can flip that power on its head.

Conclusion: Trust Is the True Reserve Asset

The U.S. debt machine still has fuel, but that fuel is trust—global trust in America’s financial stability, legal institutions, and geopolitical reach.

If the world begins to question that trust, the cost of borrowing could rise sharply, forcing fiscal choices that are politically difficult and economically painful.

The machine still runs. But it’s humming louder than ever. And the world is starting to listen.

Next week on Wolf Street Economics: “Why the Global South Is Building Its Own Financial Order.”

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