well, being part of the Roman Republic/Empire meant peace, even if it was enforced at the tip of a pilum. And the population under the Empire were more prosperous and numerous, so much that the collapse of the Empire in the West had long-lasting negative consequences (I'm mostly basing my opinion off this article: https://acoup.blog/2022/02/11/collections-rome-decline-and-f...)

Ok, but beside the aqueducts, orthography and lasting peace, what good were the Romans for us?