Originally published in 1940, Why England Slept was written by then-Harvard student and future American president John F. Kennedy. It was Kennedy's senior thesis that analyzed the tremendous miscalculations of the British leaders in facing Germany on the advent of World War II, and in doing so, also addressed the challenges that democracies face when confronted directly with fascist states.

In Why England Slept, at the book's core, John F. Kennedy asks: Why was England so poorly prepared for the war? He provides a comprehensive analysis of the tremendous miscalculations of the British leadership when it came to dealing with Germany and leads readers into considering other questions: Was the poor state of the British army the reason Chamberlain capitulated at Munich, or were there other, less-obvious elements at work that allowed this to happen? Kennedy also looks at similarities to America's position of unpreparedness and makes astute observations about the implications involved.

This re-publication of the classic book contains excerpts from the foreword to the 1940 original edition by Henry R. Luce, an American magazine magnate during that era; the foreword to the 1961 edition, also written by Luce; and a new foreword by Stephen C. Schlesinger, written in 2015.