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
In general, the economic and social condition of Italy was not primarily dependent on political distinctions; there were allied districts, such as Umbria and Etruria, in which the class of free farmers had mostly disappeared, while in others, such as the valleys of the Abruzzi, the same class had still maintained a tolerable footing or remained almost unaffected--just as a similar diversity could be pointed out in the different Roman burgess-districts.
On the other hand the political inferiority of Italy was daily displayed more harshly and more abruptly. No formal open breach of right indeed occurred, at least in the principal questions. The communal freedom, which under the name of sovereignty was accorded by treaty to the Italian communities, was on the whole respected by the Roman government; the attack, which the Roman reform party at the commencement of the agrarian agitation made on the Roman domains guaranteed to the communities of better position, had not only been earnestly opposed by the strictly conservative as well as by the middle party in Rome, but had been very soon abandoned by the Roman opposition itself.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=2