In republishing these essays in collected form, it has seemed best to
issue them as they were originally printed, with the exception of a few
slight corrections of slips in the text and with the omission of
occasional duplication of language in the different essays. A
considerable part of whatever value they may possess arises from the
fact that they are commentaries in different periods on the central
theme of the influence of the frontier in American history. [...]
Collection of essays dealing with the significance of the concept of
frontier in American history and its influence on it. Originally
published in 1920.