The United States grew into a continental nation beginning in 1845. This laid the basis for becoming a great power and a superpower, but it also tore into conflicts involving race and the extension of freedom that nearly destroyed the country in the Civil War. The simultaneous impact of the industrial revolution created new opportunities and new challenges, again involving the meaning and extension of freedom and equality.
- Woodrow Wilson: A Biography (2009)
- Breaking the Heart of the World: Woodrow Wilson and the Fight for the League of Nations (2001)
- The Warrior and the Priest: Woodrow Wilson and Theodore Roosevelt (1983)