Madison Grant 
The Conquest of a Continent / or, The Expansion of Races in America [PDF ebook] 
(Illustrated Edition)

The character of a country depends upon the racial character of the men and women who dominate it. I welcome this volume as the first attempt to give an authentic racial history of our country, based on the scientific interpretation of race as distinguished from language and from geographic distribution.
The most striking induction arising through research into the prehistory of man is that racial characters and predispositions, governing racial reactions to certain old and new conditions of life, extend far back of the most ancient civilizations. For example, the characteristics which Homer, in the Iliad and the Odyssey, attributed to his heroes and to his imaginary gods and goddesses were not the product of the civilization which existed in his time in Greece; they were the product of creative evolution long prior even to the beginnings of Greek culture and government. This creative principle—the most mysterious of the recently discovered phenomena of evolution, to which I have devoted the researches of nearly half a century—is that racial preparation for various expressions of civilization—art, law, government, etc.—is long antecedent to these institutions.
In the present volume, which I regard as an entirely original and essential contribution to the history of the United States of America, Grant goes much further and in tracing back the racial origins of the majority of our people he lays the foundation for an understanding of the peculiar characteristics of American civilization, which, all agree, is of a very new type, something the world has never before seen.