Throughout history, the countries with the smartest people has shifted from one ethnic group to another. Egyptian, Persian, greek, roman and chinese empires were all the most powerful empires in the world over the past 2000 years. They were mostly of different ethnicities and weren't white. Also the romans being white is just complete nonsense, the ancient roman historians described the romans having Mediterranean features in comparison to germans having western european features in contrast.

My point is that what determines the smartest ethnic groups are just circumstantial luck which allows the populace to take over neighboring countries, trade routes, and to acquire knowledge and advancements. Whites aren't just better than everybody else, contrary to what white supremacists would want you to believe.