However this may have been, it is certain that Rome early succeeded in freeing itself from that insuperable prejudice which elsewhere prevented the ancient city from admitting aliens to a share in its franchise. And in this victory over primeval political ideas lay the whole secret of Rome's mighty career. The victory was not indeed completed until after the terrible Social War of B.C. 90, but it was begun at least four centuries earlier with the admission of the plebeians. At the consummation of the conquest of Italy in B.C. 270 Roman burghership already extended, in varying degrees of completeness, through the greater part of Etruria and Campania, from the coast to the mountains; while all the rest of Italy was admitted to privileges for which ancient history had elsewhere furnished no precedent. Hence the invasion of Hannibal half a century later, even with its stupendous victories of Thrasymene and Cannae, effected nothing toward detaching the Italian subjects from their allegiance to Rome; and herein we have a most instructive contrast to the conduct of the communities subject to Athens at several critical moments of the Peloponnesian War. With this consolidation of Italy, thus triumphantly demonstrated, the whole problem of the conquering career of Rome was solved. All that came afterwards was simply a corollary from this. The concentration of all the fighting power of the peninsula into the hands of the ruling city formed a stronger political aggregate than anything the world had as yet seen. It was not only proof against the efforts of the greatest military genius of antiquity, but whenever it was brought into conflict with the looser organizations of Greece, Africa, and Asia, or with the semi-barbarous tribes of Spain and Gaul, the result of the struggle was virtually predetermined. The universal dominion of Rome was inevitable, so soon as the political union of Italy had been accomplished. Among the Romans themselves there were those who thoroughly understood this point, as we may see from the interesting speech of the emperor Claudius in favour of admitting Gauls to the senate.