It has been subsequently reprinted and anthologized many times, and was incorporated into Turner's 1921 book, The Frontier in American History, as Chapter I. The thesis shares his views on how the idea of the frontier shaped the American being and characteristics. He writes how the frontier drove American history and why America is what it is today. Turner reflects on the past to illustrate his point by noting human fascination with the frontier and how expansion to the American West changed people's views on their culture. It is a thesis that has been respected in the historical circle for many years.