In concluding this revision of the racial foundations upon which the history of Europe has been based it is scarcely necessary to point out that the actual results of the spectacular conquests and invasions of history have been far less permanent than those of the more insidious victories arising from the crossing of two diverse races and that in such mixtures the relative prepotency of the various human subspecies in Europe appears to be in inverse ratio to their social value. The continuity of physical traits and the limitation of the effects of environment to the individual only are now so thoroughly recognized by scientists that it is at most a question of time when the social consequences which result from such crossings will be generally understood by the public at large. As soon as the true bearing and import of the facts are appreciated by lawmakers a complete change in our political structure will inevitably occur and our present reliance on the influence of education will be superseded by a readjustment based on racial values. Bearing in mind the extreme antiquity of physical and spiritual characters and the persistency with which they outlive those elements of environment termed language, nationality and forms of government, we must consider the relation of these facts to the development of the race in America. We may be certain that the progress of evolution is in full operation to-day under those laws of nature which control it and that the only sure guide to the future lies in the study of the operation of these laws in the past. We Americans must realize that the altruistic ideals which have controlled our social development during the past century and the maudlin sentimentalism that has made America “an asylum for the oppressed,” are sweeping the nation toward a racial abyss. If the Melting Pot is allowed to boil without control and we continue to follow our national motto and deliberately blind ourselves to all “distinctions of race, creed or color,” the type of native American of Colonial descent will become as extinct as the Athenian of the age of Pericles, and the Viking of the days of Rollo. APPENDIX The maps shown facing pages 266, 268, 270, and 272 of this book attempt in broad and somewhat hypothetical lines to represent by means of color diagrams the original distribution and the subsequent expansion and migration of the three main European races, the Mediterranean, the Alpine and the Nordic, as outlined in this book. THE MAXIMUM EXPANSION OF THE ALPINES WITH BRONZE CULTURE, 3000–1800 B. C.