Book excerpt: Long before the United States was a nation, it was a set of ideas, projected onto the New World by European explorers with centuries of belief and thought in tow. From this foundation of expectation and experience, America and American thought grew in turn, enriched by the bounties of the Enlightenment, the philosophies of liberty and individuality, the tenets of religion, and the doctrines of republicanism and democracy. In engaging and accessible prose, Jennifer Ratner-Rosenhagen's introduction to American thought considers how notions about freedom and belonging, the market and morality - and even truth - have commanded generations of Americans and been the cause of fierce debate.