Question: El Narco: Inside Mexico's Criminal Insurgency is a non-fiction book, the book covers the frontline of which Mexican theater of the United States' War on Drugs, involving an ongoing low-intensity asymmetric war between the Mexican Government and various drug trafficking syndicates?
Sentence (from "El Narco: Inside Mexico's Criminal Insurgency"): The book covers the frontline of the Mexican Drug War.
Relevant evidence: Yes