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The gains have not been evenly spread. IQ has generally increased more rapidly in developing countries, with the biggest leaps seen in China and India. Progress in the developed world has been chequered - the data seem to indicate steady increases in the US, for example, but a decline in the UK.
If Americans today took the tests from a century ago, Flynn says, they would have an extraordinarily high average IQ of 130. And if the Americans of 100 years ago took today's tests, they would have an average IQ of 70 - the recognised cut-off for people with intellectual disabilities. To put it another way, IQ has been rising at roughly three points per decade.
http://www.bbc.com/news/magazine-31556802
Nutrition and education plays a role in one's IQ so IQ is not stationary in a society. As the population industrializes with better education and nutrition its IQ will increase. With the third world developing it will catch up to the IQ of first world nations over time. Racists would have you believe otherwise.