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 leading ideas on which the structure was based, on the other hand, are so obvious that it is scarcely necessary specially to set them forth. First of all, as we have already said, the immediate circle of the ruling community was extended--partly by the settlement of full burgesses, partly by the conferring of passive burgess-rights--as far as was possible without completely decentralizing the Roman community, which was an urban one and was intended to remain so.
When the system of incorporation was extended up to and perhaps even beyond its natural limits, the communities that were subsequently added had to submit to a position of subjection; for a pure hegemony as a permanent relation was intrinsically impossible. Thus not through any arbitrary monopolizing of sovereignty, but through the inevitable force of circumstances, by the side of the class of ruling burgesses a second class of subjects took its place.
It was one of the primary expedients of Roman rule to subdivide the governed by breaking up the Italian confederacies and instituting as large a number as possible of comparatively small communities, and to graduate the pressure of that rule according to the different categories of subjects. As Cato in the government of his household took care that the slaves should not be on too good terms with one another, and designedly fomented variances and factions among them, so the Roman community acted on a great scale. The expedient was not generous, but it was effectual.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=79