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
Extension of the Latin Nationality
Thus, when the eye turns from the development of constitutions and from the national struggles for dominion and for freedom which agitated Italy, and Rome in particular, from the banishment of the Tarquinian house to the subjugation of the Samnites and the Italian Greeks, and rests on those calmer spheres of human existence which history nevertheless rules and pervades, it everywhere encounters the reflex influence of the great events, by which the Roman burgesses burst the bonds of patrician sway, and the rich variety of the national cultures of Italy gradually perished to enrich a single people.
While the historian may not attempt to follow out the great course of events into the infinite multiplicity of individual detail, he does not overstep his province when, laying hold of detached fragments of scattered tradition, he indicates the most important changes which during this epoch took place in the national life of Italy. That in such an inquiry the life of Rome becomes still more prominent than in the earlier epoch, is not merely the result of the accidental blanks of our tradition; it was an essential consequence of the change in the political position of Rome, that the Latin nationality should more and more cast the other nationalities of Italy into the shade.
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Reference address : https://www.ellopos.net/elpenor/rome/2-08-law-religion-army-economy-nationality.asp?pg=43