Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Important historical effort

Knowledge of history is one of the best sources of wisdom there are. Dr. Leon Portilla, a serious anthropologist and historian, recovers here many sources of the history of the ancient inhabitants of what is now Central Mexico. Certainly advanced cultures in some respects (very backwards in some other), but doomed to fall prey to the Conquerors, mainly due to two reasons: the Spaniard's more advanced technology, and the internal dissensions of the Indian cultures. This book is very important because it allows us to understand better the societies that existed before the Conquest. Leon Portilla includes original texts and interpretations of the poems, the philosophy and the cosmovision of the Nahua world. Rigorous and extremelly well-researched.