Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Impressive!

It takes a good author to make a subject like this interesting. McCullough accomplished it!The story behind the Canal is so much more than just the physical construction involved. The years of the French construction involved a lot of corruption and scandal that I'd never heard about!Then, after about two decades, American takes over, and within a few years the canal is open for traffic. The successful fight against the deadly mosquito was one of the turing points.McCullough talks a lot about some of the politics involved, in both the French and the American stages. The story behind the Panamanian revolution was quite interesting. . . the US more or less "stole" Panama from Columbia, I guess you could say.Definitely a good book, and worth your time to read.