The earlier condition of things was a state of universal warfare, on account of the limitation of the food-supply. This warfare was checked by the beginnings of industrial civilization, which made it possible for a vastly greater population to live upon a given area, and in many ways favored social compactness. A new basis of political combination was now furnished by territorial continuity and by community of occupation. The supply of food was no longer strictly limited, for it could be indefinitely increased by peaceful industry; and, moreover, in the free exchange of the products of labor, it ceased to be true that one man's interest was opposed to another's. Men did not, it is true, at once recognize this fact, but have done so only gradually. When the clan had grown into the state, and the state into the empire, in which many states were brought together in pacific relations, the recognized sphere of moral obligation became enlarged, until at length it comprehended all mankind. The coalescence of groups of men into larger and larger political aggregates has been the chief work of civilization; and the chief obstacle to such coalescence has been warfare. Great political bodies have arisen in three ways. The first, conquest without incorporation, proved itself suicidal. The second way was conquest with incorporation, but without representation; and this lacking, the government retrograded and gradually became a despotism. The third method, federation, has been the policy of the English government. The advantage of the habit of self-government has been shown in England's wide conquest and colonization. The federative method of political union, pacific in its very conception, is assuming an unquestionable sway and destined to become universal; the progress of the race will be, as it has been, with the gradual elimination of warfare. In a race of inferior animals, any maladjustment is quickly removed by natural selection. But in man there is a wide interval between the highest and lowest degree of completeness which are compatible with maintenance of life; in all grades of civilization above the lowest, there are so many kinds of superiorities which severally enable men to survive, notwithstanding accompanying inferiorities, that natural selection cannot, by itself, rectify any particular unfitness. Hence, the action of natural selection upon man has long since been essentially diminished through the operation of social conditions. Therefore the wicked flourish. Vice is but slowly eliminated, because mankind has so many other qualities, besides the bad ones, which enable it, in spite of them, to subsist and achieve progress.