What is the author's style in American Caesar, Douglas MacArthur, 1880-1964 by William Manchester?

American Caesar by William Manchester is written in the third person point of view with the narrator being Manchester. The use of this method allows the author to provide the historical and background information that the reader needs to describe since so much of the book deals with World Wars I and II and events in the Philippines and Japan. Most readers need their memories refreshed of events that occurred during this period, especially those that occurred in other countries.