Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This is an excellent read for adults, especially with the historical backdrop the author provides

Ruben Martinez's engaging and authoritative account of the Chavez family's struggle to live in Cheran, Mexico and work in the U.S. illustrates how the long-time U.S. message "We have jobs for you" has changed to "We have jobs for you, but you'll have more trouble getting across the line." Three Chavez brothers were killed as victims in a high-speed chase crossing the border. Martinez followed migrant workers to California, Arkansas and even Norwalk, Wisconsin where he found the Enriquez family working the night shift in a meatpacking plant. Martinez, whose grandfather came to the U.S. as a field hand, brings the readers right into small village life in Southern Mexico--through the treacherous border crossings and into the toxic fields where migrants toil. This is an excellent read for adults, especially with the historical backdrop the author provides.