Of these three methods, the last is wholly useless, as was seen in the case of the two States named, which came to ruin from no other cause than that they had acquired a dominion greater than they could maintain. For to undertake to govern cities by force, especially such cities as have been used to live in freedom, is a difficult and arduous task, in which you never can succeed without an army and that a great one. But to have such an army you must needs have associates who will help to swell the numbers of your own citizens. And because Athens and Sparta neglected this precaution, whatever they did was done in vain; whereas Rome, which offers an instance of the second of the methods we are considering, by attending to this precaution reached a power that had no limit. And as she alone has lived in this way, so she alone has attained to this pitch of power. For joining with herself many States throughout Italy as her companions, who in most respects lived with her on a footing of equality, while, as has been noted, always reserving to herself the seat of empire and the titular command, it came about that these States, without being aware of it, by their own efforts, and with their own blood, wrought out their own enslavement. For when Rome began to send armies out of Italy, for the purpose of reducing foreign kingdoms to provinces, and of subjugating nations who, being used to live under kings, were not impatient of her yoke, and who, receiving Roman governors, and having been conquered by armies bearing the Roman name, recognized no masters save the Romans, those companions of Rome who dwelt in Italy suddenly found themselves surrounded by Roman subjects, and weighed down by the greatness of the Roman power; and when at last they came to perceive the mistake in which they had been living, it was too late to remedy it, so vast was the authority which Rome had then obtained over foreign countries, and so great the resources which she possessed within herself; having by this time grown to be the mightiest and best-armed of States. So that although these her companions sought to avenge their wrongs by conspiring against her, they were soon defeated in the attempt, and remained in a worse plight than before, since they too became subjects and no longer associates. This method, then, as I have said, was followed by the Romans alone; but no other plan can be pursued by a republic which desires to extend its power; experience having shown none other so safe and certain.