What if it's due to neither environmental nor genetic factors but ideas. Europe was backward until it re-absorbed classical learning and absorbed newer ideas from the Orient, which led to the renaissance and everything that followed. Did Europeans suddenly gain 40 IQ points in that time? No. Did their environment change? No.
For some reason a lot of people have a huge problem with this explanation, actually preferring either environmental determinism or racism. This is in spite of what seems to be a lot of historical evidence for it in the form of causal influence: ideas are introduced somewhere (inventions, methods, philosophies, languages, mathematics, literature, etc.) and large changes follow.
For some reason a lot of people have a huge problem with this explanation, actually preferring either environmental determinism or racism. This is in spite of what seems to be a lot of historical evidence for it in the form of causal influence: ideas are introduced somewhere (inventions, methods, philosophies, languages, mathematics, literature, etc.) and large changes follow.