"Welce isn't particularly warlike? And primes do vary - I could make a heck of a dent in an army but I'm not sure my great-aunt could have. And that's if I were convinced to participate in a war of aggression."
"...huh. I guess that must make things really different." Except it makes about zero sense that they didn't just conquer the entire world in the past? Maybe their powers are just not powerful enough and they conquered as much as they could have...
"Primes vary in power. The current batch are pretty strong but I think it's plausible that there's just never been a conquest-minded monarch and a strong batch of primes willing to support one at the same time."