Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Cod

Two thousand years distilled into 233 pages, plus a bunch of recipes, on the history of a fish. Okay, when I put it like that, it doesn't sound so fascinating, but take my word for it, you won't be able to put this book down. The Vikings only made it to Greenland and America because of the Atlantic cod, the West African slave trade was in part made possible by Atlantic cod, Iceland only survived as a nation because of Atlantic cod, and Pacific cod was one of the reasons the United States bought Alaska from Russia. Very much a cautionary tale, basically a primer in how to completely deplete a resource.