Ill just post on the 'clever' and 'friendly' part. There is no evidence from personality psychology to suggest a difference in openmindedness, altruïsme, agreeableness (big five research) and all we connect to friendliness or warmth. Cross cultural research (Hofstede) strongly suggests that individuality as a cultural marker is higher in the US than most of Europe (they score higher on collectiveness) . Eg: results from cross cultural studies (i just took Belgium as the comparing country) Its even more outspoken in other European countries: eg. Sweden. This already proves that the variation within Europe is too great to make such generalising claims: Also, the variation between europeans and americans in personality structure is less than 5%. Most of the difference lies in the neuroticism (emitional instability) domain, which fluctuates across countries and regions. Also clever, also no indication of this in IQ research. If there is anything there it is that Asians score higher. So your personal testimonial is just what it is, personal and anecdotal.