Of the latter fact we still receive the old explanation that it came of "the habit, which had ever been the curse of Hellenism, of jealous separation and frequent war between town and town, as well as internal feuds in the several cities themselves."[74] But this is clearly no _vera causa_, as these symptoms are duplicated in the history of Rome itself. The determining forces must, then, be looked for in the special conditions. The Greeks, indeed, brought with them the tradition of the separate City-State; but just as the cities remained independent in Greece by reason of natural conditions,[75] so the Greek cities of Italy remained isolated and stationary at a certain strength, because their basis and way of life were commercial, so that while they restricted each other's growth or dominance they were in times of peace mutually nutritive. They wanted customers, not plunder. For the Romans plunder was the first social need after agriculture, and as they began they continued. When Jugurtha learned that anything could be had of the Romans for gold, he had but read an open secret. Of course, the functions that were originally determined by external conditions came in time to be initial causes--the teeth and claws, so to speak, fixing the way of life for the body politic. The upper-class Romans became, as it were, the experts, the specialists of war and empire and administration. Until they became wholly demoralised by habitual plunder, they showed, despite their intense primeval superstition of citizenship,[76] a degree of sagacity in the conciliation of their defeated rivals which was a main cause of their being able to hold out against Hannibal, and which contrasts markedly with the oppressive and self-defeating policy of imperial Carthage, Athens, and Sparta. Their tradition in part was still that of conquering herdsmen, not wholly turned into mere exploiters of humanity. Pitted against any monarch, they were finally invincible, because a still-growing class supplied their administrators, as the swarming provinces supplied their soldiers, and because for all alike war meant plunder and new lands, as well as glory. Pitted against a republic like Carthage, even when its armies were led by a man of genius, they were still insuppressible, inasmuch as Carthage was a community of traders employing mercenaries, where Rome was a community in arms, producing generals as Carthage produced merchants. Mithridates failed in turn, as Hannibal failed. The genius of one commander, exploiting passive material, could not avail against the accumulated faculty for organisation in the still self-renewing Roman patriciate.[77]