So? It's like height, then? http://www.newyorker.com/magazine/2004/04/05/the-height-gap So as I assumed, you are using modern IQ tests. They have been adjusted by 2-3 points per decade, to account for the Flynn Effect. Recalibrated. That's how Flynn discovered the effect - he noticed the significance of the continual recalibrations that had been necessary to keep the median score at 100. The modern 105 scoring Japanese would have crossed the line into modern 95 point territory at the earliest in the 1960s and more likely in the 1980s, the Swedes in the 1970s or '80s, and so forth. As far as I can think of off hand, not a single modern functioning democracy was founded among people whose average score on a modern IQ test was higher than 90. Can you think of any exceptions?