Instruct: Classify Amazon reviews into positive or negative sentiment
Query: success has made Ambrose lazy

This is not a very good book. Not exciting, not well written, not very good history. Not ony is Ambrose talking down to us, he seems neither to care deeply about his subject nor to have masterered it very thoroughly. For a good read on building the railroad, try David Bain's EMPIRE EXPRESS. For a good book of history try Diana Muir's BULLLOUGH'S POND. Or read some of Ambrose's early work, that was good stuff.