Out of curiosity I just tried this prompt:
> Generate a photo of the founding fathers of a future, non-existing country. Five people in total.
with Nano Banana Pro (the SOTA). I tried the same prompt 5 times and every time black people are the majority. So yeah, I think the parent comment is not that far off.
I mean it's still far off, because they said "historical context", i.e., the actual past, but your prompt is about a hypothetical future.
(I suspect you tried a prompt about the original founding fathers, and found it didn't make that mistake any more.)
Luck? 1 black person, 3 south Asian in total for me.
But for an out of context imaginary future... why would you choose non-black people? There's about the same reason to go with any random look.