When President Bush, before the Knesset, used the word "appeasement" to label those who would negotiate with Iran's Mahmoud Ahmadinejad, he invoked the most powerful analogy in any debate over war and peace. No man wishes to be regarded as an "appeaser." But, as this writer has discovered since my book "Churchill, Hitler and The Unnecessary War: How Britain Lost Its Empire and the West Lost the World" was launched Memorial Day, there is a deep well of ignorance about what happened that September, 70 years ago. Why did Neville Chamberlain go to Munich? How did Munich lead to World...