when has the national debt been the highest
History of the United States public debt The United States public debt as a percentage of GDP reached its highest level during Harry Truman's first presidential term, during and after World War II. Public debt as a percentage of GDP fell rapidly in the post-World War II period, and reached a low in 1973 under President Richard Nixon. Debt as a share of GDP has consistently increased since then, except during the terms of presidents Jimmy Carter and Bill Clinton. Public debt rose during the 1980s, as President Reagan cut tax rates and increased military spending. It fell during the 1990s, due to decreased military spending, increased taxes and the 1990s boom. Public debt rose sharply in the wake of the 2007–08 financial crisis and the resulting significant tax revenue declines and spending increases.