William Manchester's book The Assassination of President Kennedy, published in 1967, was published not only at the behest of the author, but also at the request of the Kennedy clan. Having become a political bestseller, it has been reprinted several times both in the United States and in other countries of the world. The author supports his conclusions, conclusions, and messages with a variety of documentary evidence. As Martin Luther King correctly noted in his time, “it is more important to find out not who killed, but what killed John F. Kennedy.” This is what the author of the book is trying to find out.