In 100 years the federal debt grew 1,903-fold, and only 11 of those years saw it fall

Asked:

track US federal debt for the past 100 years mapped to the president at the time: compare and contrast increases and decreases in the debt with regards to republican and democratic presidents

All 100 of 100 requested annual intervals, FY1926–FY2025, are covered — nominal gross federal debt at each fiscal-year end, mapped to the sitting president. Debt rose from $19.64B (1926) to $37.375T (FY2025). Democratic-mapped intervals cover 52 years and $20.106T of increase; Republican-mapped intervals cover 48 years and $17.248T. The series is single-sourced: one FRED series backs 87 of the 100 annual rows.

Debt level, 1926–2025 (log scale)

Democratic president at observationRepublican president

Annual change: increases above zero, decreases below

DemocraticRepublican — bar height is the year's dollar change (symmetric log scale so 1920s decreases stay visible)

Total change mapped to each president, in order of office

Donald Trump's total combines FY2017–FY2020 and FY2025, because the same president name spans non-contiguous terms. Dollar totals mechanically favor recent presidents: the nominal base is thousands of times larger today, so percentage growth is the fairer cross-era comparison.

Democratic vs Republican intervals

Democratic — 52 years

Total nominal change: +$20.106T
Mean annual change: +9.67%
Median annual change: +6.27%
Years the debt fell: 3 (1947, 1948, 1951 under Truman)

Republican — 48 years

Total nominal change: +$17.248T
Mean annual change: +6.72%
Median annual change: +6.85%
Years the debt fell: 8 (Coolidge 3, Hoover 2, Eisenhower 2, Nixon 1)

These are descriptive mappings, not performance rankings: Congress shares fiscal authority, wars, recessions and emergencies dominate the largest moves (WWII lifted debt 80% in FY1943 alone; the pandemic added $4.226T in FY2020), and each interval is assigned solely to the president in office on the fiscal-year observation date. Values are nominal, not inflation-adjusted or scaled to GDP.

Findings

Decreases are rare and old: all 11 down years fall between 1926 and 1969 — Republicans hold 8 of them, Democrats 3, and none has occurred in the past 56 years. fred.stlouisfed.org

Party totals and growth rates point in different directions: Democratic intervals carry the larger dollar total ($20.106T vs $17.248T) and the higher mean (9.67% vs 6.72%), but the Republican median annual change (6.85%) exceeds the Democratic median (6.27%). fred.stlouisfed.org

Fastest percentage growth belongs to FDR's WWII years — 23.2% mean across 12 years with zero decreases — while the largest dollar totals sit with Obama (+$9.553T), Trump (+$9.507T) and Biden (+$8.328T). fred.stlouisfed.org

Calvin Coolidge is the only president in the span whose every mapped year cut the debt: −$2.84B over 1926–1928, a −4.86% mean annual change. amsflow.com

All 100 annual intervals

FY	President	Party	Debt	Change $	Change %	Source

Method: 100 annual observations of nominal U.S. federal debt, FY1926–FY2025, assembled from a 1925 historical total-debt base (Historical Text Archive), AMSFlow National Debt for 1926–1938 (13 rows) and FRED Gross Federal Debt (FYGFD) for 1939–2025 (87 rows); the naming/source change around 1939 is a comparability caveat. Endpoints are near fiscal year-end (June 30 historically, September 30 later). Each interval's change is the endpoint-to-endpoint difference and is mapped to the president in office at the observation date — a descriptive time mapping, not attribution of responsibility. President–party mapping from en.wikipedia.org. Dollars are nominal, not inflation-adjusted or GDP-normalized. Precomputed president and party aggregates are taken as given, one value per group. Partial FY2026 excluded.

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