These definitions all end in the idea of unity under one government. They contemplate political unity, rather than unity of blood or language. Undoubted nations exist without the latter. Various accents of speech and various types of manhood, with the great distinction of color, which we encounter daily, show that there is no such unity here. But this is not required. If the inhabitants are of one blood and one language, the unity is more complete; but the essential condition is one sovereignty, involving, of course, one citizenship. In this sense Gibbon employs the word, when, describing the people of Italy,--all of whom were recognized as Roman citizens,--he says: “From the foot of the Alps to the extremity of Calabria, all the natives of Italy were born citizens of Rome. Their partial distinctions were obliterated, and they insensibly _coalesced into one great Nation_, united by language, manners, and _civil institutions_, and equal to the weight of a powerful empire.”[7] Here dominion proceeding originally from conquest is consecrated by concession of citizenship, and the great historian hails the coalesced people as Nation. One of our ablest writers of History and Constitutional Law, Professor Lieber, of Columbia College, New York, has discussed this question with learning and power.[8] According to this eminent authority, Nation is something more than a word. It denotes that polity which is the normal type of government at the present advanced stage of civilization, and to which all people tend just in proportion to enlightenment and enfranchisement. The learned Professor does not hesitate to say that such a polity is naturally dedicated to the maintenance of all the rights of the citizen as its practical end and object. It is easy to see that the Nation, thus defined, must possess elements of perpetuity. It is not a quicksand, or mere agglomeration of particles, liable to disappear, but a solid, infrangible crystallization, against which winds and rains beat in vain. * * * * *