Douglas Wilson spent a great deal of time researching his subject. This is a very readable book filled with information on the history of each city, clearly defining the reason each became so powerful and influential.
I really enjoyed this book because Mr. Wilson drew me in. He re-introduced me to people I had studied in history classes, sometimes showing me a new side of them. I enjoyed how he showed that the population of these cities provided influence and information that are still so important today. I you enjoy history, you will enjoy this book.