1950 - Art and Life in America by Oliver W. Larkin
1951 - The Old Northwest, Pioneer Period 1815-1840 by R. Carlyle Buley
1952 - The Uprooted by Oscar Handlin
1953 - The Era of Good Feelings by George Dangerfield
1954 - A Stillness at Appomattox by Bruce Catton
1955 - Great River: The Rio Grande in North American History by Paul Horgan
1956 - The Age of Reform by Richard Hofstadter
1957 - Russia Leaves the War: Soviet-American Relations, 1917-1920 by
George F. Kennan
1958 - Banks and Politics in America by Bray Hammond
1959 - The Republican Era: 1869-1901 by Leonard D. White and Jean Schneider
According to The Pulitzer Prize.