This is an inconsistent work. Some chapters are good, most are okay, and a few are totally inadequate to learn about the events and/or people discussed. In addition, the timeline is wonky and difficult to follow - the author seems to skip around without alerting the reader.
The audience for this book is children and we need to be able to explain things simply and without talking down to them. This author lacks consistency in this skill.
What is a bad chapter? The author repeatedly makes reference to the significance of the person/event without illustrating the impact of their life, or giving concrete events to explain them.
If you need a broad sweep overview type book, this might do it for you. You might want to get a copy from your library and read it before you purchase. Now that we have it, we will probably keep it, but in our curriculum we have used the internet and other books to fill in the chapters that are lacking.