The real test of national existence is ultimately a sentimental one. Does the nationality inhabiting a given country regard the government under which it lives as a true expression of its peculiar genius and will? Does the State, of which it forms a part, exist by its consent, or has it been imposed upon it by some alien authority or nationality? Is it a territorial unity, or has it been split up into sections by artificial frontiers? All these questions must be answered before we can say of any nationality that it is also a nation. The "national idea," therefore, which has been one of the chief factors in modern history, is essentially an idea of development. Its root is the conception of nationality, that is of a people consciously united by race, language, and culture; and from this springs the larger conception of nationhood, that is of a nationality possessing its own political institutions, governed by its own consent, and co-extensive with its natural boundaries. As we shall see later, political development does not always stop at the Nation-State. Further growth, however, is extra-national in character; it may either take the parasitical form of one nation imposing its will and its "culture" upon other nations, or it may assume the proportions of that highest type of polity yet known to mankind, a commonwealth of nations freely associating together within the confines of a single sovereign State.[1] [Footnote 1: See Chapter IX. for further treatment of this.] §2. _The Birth of Nationalism: Poland and the French Revolution_.--With these general principles in mind let us now consider the national idea at work in the nineteenth century. Nations, in the sense just defined, have of course long existed in Europe. England, Scotland, and Switzerland are nations whose life-histories date right back to the Middle Ages. Joan of Are was a nationalist, and France has been a nation since the end of the Hundred Years' War in 1453. Spain became a nation a few years later by the expulsion of the Moors and the union of Castille and Aragon under Ferdinand and Isabella. Holland, again, acquired her national freedom in her great struggle against Spain in the sixteenth century. But it was not until the end of the eighteenth century that nationalism became a real force in Europe, an idea for which men died and in whose name monarchies were overthrown. "In the old European system," writes Lord Acton, "the rights of nationalities were neither recognised by governments nor asserted by the people. The interest of the reigning families, not those of the nations, regulated the frontiers, and the administration was conducted generally without any reference to popular desires. Where all liberties were suppressed, the claims of national independence were necessarily ignored, and a princess, in the words of Fénelon, carried a monarchy in her wedding portion."[1] The State was, in short, regarded as a purely territorial