Instruct: Classify Amazon reviews into positive or negative sentiment
Query: History, and the Future, are not Linear

Spengler is extremely erudite. He is convincing, as far as this reader can understand him, that the West is not on a linear progression of constant improvement---with only a few bumps in the road. Eventually, the West will decline. (In the 1930s, long after publication of "Decline" he belittled the idea of a Thousand-Year Reich as beyond the capability of any group of humans. The Nazis suppressed his works but did not harass Spengler himself.)