Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
On his death matters substantially reverted to their old position. The Greek cities found themselves once more isolated and once more left to protect themselves as best they might by treaty or payment of tribute, or even by extraneous aid; Croton for instance repulsed the Bruttii about 430 with the help of the Syracusans. The Samnite tribes acquire renewed ascendency, and were able, without troubling themselves about the Greeks, once more to direct their eyes towards Campania and Latium.
But there during the brief interval a prodigious change had occurred. The Latin confederacy was broken and scattered, the last resistance of the Volsci was overcome, the province of Campania, the richest and finest in the peninsula, was in the undisputed and well-secured possession of the Romans, and the second city of Italy was a dependency of Rome. While the Greeks and Samnites were contending with each other, Rome had almost without a contest raised herself to a position of power which no single people in the peninsula possessed the means of shaking, and which threatened to render all of them subject to her yoke.
A joint exertion on the part of the peoples who were not severally a match for Rome might perhaps still burst the chains, ere they became fastened completely. But the clearness of perception, the courage, the self-sacrifice required for such a coalition of numerous peoples and cities that had hitherto been for the most part foes or at any rate strangers to each other, were not to be found at all, or were found only when it was already too late.
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Reference address : https://www.ellopos.net/elpenor/rome/2-06-italians-rome.asp?pg=3