There is a strong correlation between cultures and races. That’s because of the strong correlation between AVERAGE IQ and races.
Culture is downstream of average IQ.
Races with lowest AVERAGE IQ have the worst cultures by any measure.
And that’s easy to explain, if you first define what culture is.
Culture is downstream of average IQ.
Increased average IQ probably has a hand in the possibility of a "better" culture.
But races with high average IQ have had terrible cultures. Look at the Germans in WWII. Look at the Japanese. Look at the Aztecs at the time of Cortez.
Consider the Spartans.
Of course, the definitional problem remains.