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
We have already pointed to the fact, that at this epoch the neighbouring lands--southern Etruria, Sabina, the land of the Volscians, --began to become Romanized, as is attested by the almost total absence of monuments of the old native dialects, and by the occurrence of very ancient Roman inscriptions in those regions; the admission of the Sabines to full burgess-rights at the end of this period(44) betokens that the Latinizing of Central Italy was already at that time the conscious aim of Roman policy.
44. Cf. I. III. Localities of the Oldest Cantons
The numerous individual assignations and colonial establishments scattered throughout Italy were, not only in a military but also in a linguistic and national point of view, the advanced posts of the Latin stock. The Latinizing of the Italians was scarcely at this time generally aimed at; on the contrary, the Roman senate seems to have intentionally upheld the distinction between the Latin and the other nationalities, and they did not yet, for example, allow the introduction of Latin into official use among the half-burgess communities of Campania. The force of circumstances, however, is stronger than even the strongest government: the language and customs of the Latin people immediately shared its predominance in Italy, and already began to undermine the other Italian nationalities.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/2-08-law-religion-army-economy-nationality.asp?pg=44