Jantelagen

Jantelagen is a Swedish word meaning an ingrained aversion to standing out. The North Asians seem to have it too. The South seems to show almost the opposite of this, although there are always exceptions. What would a southern word for loud extroversion be? Chutzpah?  It also originally seemed to apply physiologically.

These traits are developed slower in natural selection, and then sexual selection helps determine the choices females make, which can exaggerate these traits over time.

With less to pay for any mistakes they make, modern females seem to be more freely choosing males, southern or northern or whatever, since the natural environment doesn't seem to matter as much for the survival of their offspring, assuming they decide to have offspring.

Without the pressures of difficult natural selection, and without the values of older traditions, traits are entering the gene pool in modern times that would not have otherwise. I suppose this can change depending on the ease of survival.