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1. 

Post–World War II Decline

After World War II, the U.S. national debt peaked at over 120% of GDP in 1946, then steadily declined for three decades. By the mid-1970s, the debt-to-GDP ratio had fallen to a postwar low of around 31.8%.

📌 Sources:

  • Congressional Budget Office: https://www.cbo.gov/publication/60419
  • Auerbach & Gale (2024): https://eml.berkeley.edu/~auerbach/Auerbach%20Gale%2020240306.pdf
  • CEIC Data: https://www.ceicdata.com/en/indicator/united-states/government-debt–of-nominal-gdp

2. 

Stability in the 1960s–70s

From the 1960s through the 1970s, debt as a share of GDP remained low and relatively stable.

  • In 1969: ~35%
  • In 1974: ~31% This occurred despite economic challenges like the Vietnam War and oil shocks.

📌 Sources:

  • AP News analysis: https://apnews.com/article/1a6892a39be7b3dab039f54dc11b99b1

3. 

Reversal with Reagan’s Trickle-Down Policies

Beginning in 1981, Reagan’s tax cuts (especially for high earners and corporations) and large increases in defense spending reversed the debt trend.

  • 1981: ~32.5%
  • 1985: ~43.8%
  • 1989: ~53.1%

📌 Sources:

  • Reaganomics overview (Wikipedia): https://en.wikipedia.org/wiki/Reaganomics
  • Auerbach & Gale: https://eml.berkeley.edu/~auerbach/Auerbach%20Gale%2020240306.pdf

4. 

Continued Growth: 2000s to COVID-19

Debt continued to rise under successive administrations. Major causes included:

  • 2001 and 2017 tax cuts
  • Wars in Iraq and Afghanistan
  • The 2008 financial crisis and COVID-19 relief

By:

  • 2013: debt surpassed 100% of GDP
  • 2020: reached ~128%
  • 2024: stabilized around 124%

📌 Sources:

  • Macrotrends data: https://www.macrotrends.net/global-metrics/countries/USA/united-states/debt-to-gdp-ratio
  • CEIC Global Database: https://www.ceicdata.com/en/indicator/united-states/government-debt–of-nominal-gdp

5. 

Current and Projected Debt

As of late 2024, the debt-to-GDP ratio remains above 120%, the highest since World War II. The Congressional Budget Office projects the ratio will reach 122% by 2034, assuming no major fiscal changes.

📌 Source:

  • CBO Long-Term Budget Outlook (2024): https://www.cbo.gov/publication/60419

✅ Summary

  • Before 1981, debt-to-GDP was low and falling.
  • After Reagan’s trickle-down tax cuts, debt began a long upward trend.
  • By 2024, the debt is at historic highs, underscoring the long-term effects of fiscal policy shifts beginning in the early 1980s.