Robert Anton Wilson was interested in revisionist views on World War II, but here's a secret history he never got to read: The one by Herbert Hoover.
Freedom Betrayed: Herbert Hoover's Secret History of World War II and Its Aftermath argues that the U.S. should have stayed out of World War II, and that Franklin Roosevelt maneuvered to get the U.S. into it. It's been ignored by mainstream book review outlets since it came out last year, and I only finally stumbled on to a review a couple of weeks ago.
Here is a review from The American Spectator. Here is a discussion on a Lew Rockwell radio show.