> I thought that it was history that Rome was just a small city in the periphery of the Etruscan city-state coalition

While it is a common cliche to say Rome was "just a small village" it is worth noting that is mostly Roman self mythologizing being accepted uncritically--By the late sixth/early fifth century Rome was already the great power in central Italy. As an illustrative proxy, the temple of Jupiter Optimus Maximus one of the largest in the entire Mediterranean, larger than any Etruscan temple.