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
In this way the small initial movements made by the Servian constitution--such as, in particular, the handing over to the army the right of assenting to the declaration of an aggressive war(11)--attained such a development that the curies were completely and for ever cast into the shade by the assembly of the centuries, and people became accustomed to regard the latter as the sovereign people. In this assembly debate took place merely when the presiding magistrate chose himself to speak or bade others do so; of course in cases of appeal both parties had to be heard. A simple majority of the centuries was decisive.
11. Cf. I. VI. Political Effects of the Servian Military Organization
As in the curiate assembly those who were entitled to vote at all were on a footing of entire equality, and therefore after the admission of all the plebeians into the curies the result would have been a complete democracy, it may be easily conceived that the decision of political questions continued to be withheld from the curies; the centuriate assembly placed the preponderating influence, not in the hands of the nobles certainly, but in those of the possessors of property, and the important privilege of priority in voting, which often practically decided the election, placed it in the hands of the -equites- or, in other words, of the rich.
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Reference address : https://www.ellopos.net/elpenor/rome/2-01-constitution-magistrate.asp?pg=22