Not wishing to enter the US vs UK debate . . . but I do recommend a recent book about Churchill during the Blitz: "The Splendid and the Vile" by Erik Larson (author of "The Devil in the White City" among other books). Makes it clear how bleak things looked for the Brits, when they stood alone against Hitler after the fall of France and before Hitler made the colossal error of attacking the Soviet Union.