Change My Mind

Rome was very diverse at the height of its power, and many of its greatest thinkers came from outside the ranks of the inbred patricians. Rome survived so long precisely because it found a way to attract the best people to its imperium. That has always been the strength of the USA also.

Since birth, in fact. It was started by outsiders who welcomed other outsiders.

No, it got its start through diversity - literally from its inception, nascent Rome was so short on population, it openly welcomed outsiders.

And thus it utilized talents from far and wide to build its empire.
And not some, but near all, as unlike most of its contemporaries, much of Roman innovation wasn't, it was acquired from others.

Same with Sumer, Egypt, China, Iran... All the big earliest empires didn't supplant the people they conquered, they utilized them.... Same in the Americas, when the Spanish first encourage everyone from the Aztec city Incas, that's exactly what they saw, multi-ethnic societies in which different cultures and technologies were combined.

Not all societies did, keeping to themselves, which is why they stayed small, and were either absorbed by others or died out over time.

No.