U.S. Debt Markets Rattle Over War Costs

Historically, war has been a primary driver of sharp increases in the U.S. national debt. The debt incurred during the American Revolution amounted to $75 million, while the Civil War pushed the debt from $65 million in 1860 to nearly $3 billion by 1865. The method of financing these conflicts has varied. World War II was funded through a combination of debt and higher taxes, while the Korean War was paid for almost entirely by tax increases. In contrast, the wars in Iraq and Afghanistan were financed almost completely by debt, as tax rates were cut simultaneously, leading to a historic rise in debt levels. Typically, geopolitical crises trigger a "flight to safety," where investors sell riskier assets and buy U.S. Treasury bonds, which are considered a safe haven. This increased demand for bonds pushes their prices up and yields (the government's borrowing cost) down. However, the current conflict is creating a more complex reaction. While an initial flight to Treasurys occurred, yields have also faced upward pressure. Investors are weighing the safety of government bonds against the risk that war-driven energy price spikes could fuel higher inflation, potentially delaying interest rate cuts by the Federal Reserve. These market jitters come as the U.S. faces a precarious fiscal situation. The national debt has surpassed $38.7 trillion, and the International Monetary Fund projects it could reach 140% of the nation's GDP by 2031. Foreign investors currently hold about 30% of publicly held U.S. debt, amounting to over $8.5 trillion. A sustained drop in foreign demand for U.S. bonds could force borrowing costs higher, adding another layer of risk to the economic outlook.