I once was interviewing a Japanese girl for entrance at Iolani School. I said to her mother, "I can't help but notice you come from Hiroshima. If it is not too painful to relate, were you there when it was bombed? "Yes, my mother was looking out the window at the breakfast table. She was blinded by the flash. Somehow we escaped to Nagasaki. We thought we would be safe in this Christian city."
Well, nobody ever went broke underestimating the historical knowledge of the American people. BTW: "Fat man" was named after Sydney Greenstreet's character in The Maltese Falcon, not Winston Churchill.
P.G. Wodehouse would probably have been the extent of our knowledge: