To America: Personal Reflections of an Historian. Stephen E. Ambrose. Simon & Schuster. 267 pages; index; $24.
Much like the men and women about whom he wrote for nearly four decades, the late Stephen Ambrose provokes criticism and admiration. With widespread allegations of plagiarism over his history of the 15th Air Force and Ambrose's subsequent acknowledgment of the intellectual capital that he owed several authors, it has become highly fashionable to denigrate one of America's most prominent historians as a "popular purveyor of poorly researched history." In To America, Ambrose returns to his roots and what he does best-- tell a story. In his own words, "The last five …