Whites (Western Civilization) was really were not dominant in the way we are discussing until after the end of the Middle Ages. Do you disagree?
Not at all. Perhaps even later than that. We were almost done with them when a bunch of dudes on horses came out of the east and would have changed everything if not for a little dumb luck.
I really don't know enough about this (like that's ever stopped me before!), but I do find it all interesting. Yes, clearly it's all very interconnected and complicated with a ton of luck mixed in everywhere. (with the added bonus of a veneer of racism and a think undercoat of potential racism)