"A look through these volumes shows most conclusively that a new source of history is being developed—a source which deals with the operation of the most effective causes influencing human affairs."—Iowa Journal of History and Politics.
"The successive volumes in the series may certainly be awaited with great interest, for they promise to deal with the most romantic phases of the awakening of America at the dawn of occidental civilization."—Boston Transcript.
"The publishers have done their part toward putting forth with proper dignity this important work. It is issued on handsome paper and is illustrated with many maps, diagrams, and old prints."—Chicago Evening Post.