Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Outstanding Scholarly Review of the Political Period Just Before the US Civil War

I discovered this work while reviewing some new material on A. Lincoln and the Civil War, which are my real interest. I am amazed at how detailed and clearly the author has sifted through the period covered. His insight and attention to detail have provided a great deal to consider. My knowledge and understanding of this period has risen tremendously and I only regret that I didn't "discover" these books much earlier.