What is the author's style in Truman by David McCullough?

McCullough, using Truman's own diaries and letters, writes about his life on an almost day-by-day basis. If this book were a movie, the camera would always be on Truman. He would be in every scene.

Truman is the star, and everyone else is a supporting character. Even great men of the twentieth century like General Dwight Eisenhower, British Prime Minister Winston Churchill, and President Franklin Roosevelt are supporting players in the Truman show.