Several prominent ethnologists, particularly Holsti, the present Minister of Foreign Affairs of the Finnish Free State, have attacked the basic principle formulated and demonstrated in this Work, but they have failed, because their definition of the State assumed the very matter that required to be proven. They have brought together a large array of facts in proof of the existence of some forms of _Government_ and _Leadership_, even where no classes obtained, and to the substance of these forms they have given the name of “The State.” It is not my intention to controvert these facts. It is self-evident, that in any group of human beings, be it ever so small, there must exist an authority which determines conflicts and, in extraordinary situations, assumes the leadership. But this authority is not “The State,” in the sense in which I use the word. The State may be defined as an organization of _one class_ dominating over the other classes. Such a class organization can come about in one way only, namely, through conquest and the subjection of ethnic groups by the dominating group. This can be demonstrated with almost mathematical certainty. Not one of my critics has brought proofs to invalidate this thesis. Most modern sociologists, among whom may be named Albion Small, Alfred Vierkandt and Wilhelm Wundt, accept this thesis. Wilhelm Wundt, in particular, asserts in unmistakable language, that “the political society (a term identical with the State in the sense employed in this book) first came about and could originate only in the period of migration and conquest,” whereby the subjugation of one people by another was effected. But even some of my opponents are favorably inclined to my arguments, as in the case of the venerable Adolf Wagner, whose words I am proud to quote. In his article on “The State” in the _Handwörterbuch der Staatswissenschaften_, he writes: “The sociologic concept of the State, to which I have referred, particularly in the broad scope and treatment of it given by Oppenheimer, deserves careful consideration, especially from political economists and political historians. The vista opened out, from this point of view, of the economic development of peoples and that of the State during historic times, should be attractive even to the opponents of the concept itself.” The “sociologic concept of the State,” as Ludwig Gumplowicz termed it, is assured of ultimate general acceptance. Its opponents are strenuous and persevering, and I once called them “the sociologic root of all evil;” but the concept, none the less, is the basic principle of “bourgeoisie” sociology, and will be found of value in the study, not only of economics and history, but in that of Law and Constitutional History. I permit myself to make a few remarks on this point.