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
The whole conduct of the burgesses with reference to the government as well as to the opposition shows quite clearly that the same mighty patriotism before which even the genius of Hannibal had to quit the field prevailed also in the Roman comitia. No doubt they often erred; but their errors originated not in the mischievous impulses of a rabble, but in the narrow views of burgesses and farmers.
The machinery, however, by means of which the burgesses intervened in the course of public affairs became certainly more and more unwieldy, and the circumstances in which they were placed through their own great deeds far outgrew their power to deal with them. We have already stated, that in the course of this epoch most of the former communities of passive burgesses, as well as a considerable number of newly established colonies, received the full Roman franchise.(37)
37. Cf. III. XI. Italian Subjects, Roman Franchise More Difficult of Acquisition
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Reference address : https://www.ellopos.net/elpenor/rome/3-11-government-governed.asp?pg=48