Ebbie - I read the same book--"The Plot Against America"--and it changed the way I see Philip Roth completely. It was published in 2004, actually.
             He attacked both Henry Ford and Charles Lindbergh because of their alleged attitudes towards Jews. If one looks into the comments of Ford and Lindbergh at the time, one finds they were actually concerned more about international banking cartels, and both had reasons, personal and financial, to oppose America's entry into the war.
             I came away thinking the book to be an outrageous attempt to re-write history, and I agree that the ending didn't leave the reader any better informed than he/she probably was in the opening paragraph.