GDP, debt and debt to GDP ratio of the U.S. between 1900 and 1960-20170202-gdp-debt-usa-1900-1960-gif

Debt to GDP evolution :

William McKinley : -2%
Theodore Roosevelt : -2%
William H. Taft : -1%
T. Woodrow Wilson : +25%
Warren G. Harding : -6%
J. Calvin Coolidge : -10%
Herbert C. Hoover : +24%
Franklin D. Roosevelt : +76%
Harry S. Truman : -47%
Dwight D. Eisenhower : -16%

Sources :

Treasurydirect.gov
Stlouisfed.org.