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
It cannot be denied that these changes -de facto- and -de jure- in the relations of the Italian subjects exhibit at least an intimate connection and consistency. The situation of the subject classes was throughout deteriorated in proportion to the gradations previously subsisting, and, while the government had formerly endeavoured to soften the distinctions and to provide means of transition from one to another, now the intermediate links were everywhere set aside and the connecting bridges were broken down.
As within the Roman burgess-body the ruling class separated itself from the people, uniformly withdrew from public burdens, and uniformly took for itself the honours and advantages, so the burgesses in their turn asserted their distinction from the Italian confederacy, and excluded it more and more from the joint enjoyment of rule, while transferring to it a double or triple share in the common burdens. As the nobility, in relation to the plebeians, returned to the close exclusiveness of the declining patriciate, so did the burgesses in relation to the non-burgesses; the plebeiate, which had become great through the liberality of its institutions, now wrapped itself up in the rigid maxims of patricianism.
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Reference address : https://www.ellopos.net/elpenor/rome/3-11-government-governed.asp?pg=36