World War II debt peak (1946)
Federal borrowing to fight World War II pushed debt held by the public to 106% of GDP, the highest ratio in U.S. history. The war ended the year before, and the government was still carrying the cost.
Debt stayed large while the economy demobilized and spending fell.
Fast postwar growth and balanced budgets cut the ratio for three decades, which is why 106% stood as the record.
The Congressional Budget Office projects today's ratio will pass that 1946 record, reaching 120% by 2036.
