Again, the State must assure itself a safe foundation, if it is to have stability, and to be able to resist the shocks it cannot help experiencing, as well as the efforts it will be forced to make for its maintenance; for all peoples have a kind of centrifugal force that makes them continually act one against another, and tend to aggrandise themselves at their neighbours' expense, like the vortices of Descartes. Thus the weak run the risk of being soon swallowed up; and it is almost impossible for any one to preserve itself except by putting itself in a state of equilibrium with all, so that the pressure is on all sides practically equal. It may therefore be seen that there are reasons for expansion and reasons for contraction; and it is no small part of the statesman's skill to hit between them the mean that is most favourable to the preservation of the State. It may be said that the reason for expansion, being merely external and relative, ought to be subordinate to the reasons for contraction, which are internal and absolute. A strong and healthy constitution is the first thing to look for; and it is better to count on the vigour which comes of good government than on the resources a great territory furnishes. It may be added that there have been known States so constituted that the necessity of making conquests entered into their very constitution, and that, in order to maintain themselves, they were forced to expand ceaselessly. It may be that they congratulated themselves greatly on this fortunate necessity, which none the less indicated to them, along with the limits of their greatness, the inevitable moment of their fall. CHAPTER X THE PEOPLE (_continued_) A body politic may be measured in two ways--either by the extent of its territory, or by the number of its people; and there is, between these two measurements, a right relation which makes the State really great. The men make the State, and the territory sustains the men; the right relation therefore is that the land should suffice for the maintenance of the inhabitants, and that there should be as many inhabitants as the land can maintain. In this proportion lies the _maximum_ strength of a given number of people; for if there is too much land, it is troublesome to guard and inadequately cultivated, produces more than is needed, and soon gives rise to wars of defence; if there is not enough, the State depends on its neighbours for what it needs over and above, and this soon gives rise to wars of offence. Every people, to which its situation gives no choice save that between commerce and war, is weak in itself: it depends on its neighbours, and on circumstances; its existence can never be more than short and uncertain. It either conquers others, and changes its situation, or it is conquered and becomes nothing. Only insignificance or greatness can keep it free.