Instruct: Classify Amazon reviews into positive or negative sentiment
Query: INVALUABLE PERSPECTIVE

This is one of the best things I've ever read, even independent of the AP exam, because its main focus is not only on the facts of history, but their SIGNIFICANCE. Substantial portions of each chapter are devoted to an overview of the period, what was most important about it, and comparing and contrasting it with other historical developments. I am actually a teacher studying for the CSET, and this book has been invaluable to me in how I will present this information to my students. So many texts lack this overview, or present facts with insufficient discussion as to why we should care about them!