High IQ test scores showing a large measure of success for a society, culture, race, or individual is flawed. Even highly educated professors who possess these vaunted high IQ test scores have a hard time quantifying exactly what intelligence is, much less how to test for it in a meaningful way. High, average, or low IQ test scores don't always correlate into real world success or failure of an individual; much less society as a whole. At best IQ testing can give a limited insight into an individuals potential, but a high IQ alone doesn't guarantee an individuals success in the world; much less the success of a society, culture, or race as a whole. Causation and correlation hinge upon a multitude of factors, some of which may not be obvious from a cursory glance.
Guns Germs And Steel was a good book by Jared Diamond, which was adapted into 3 part documentary. His quest seeks out possible explanations into how winners of the vagina lottery born in the West, rose to dominate the world and decree themselves the apex of civilization; as other cultures languish. He offers a compelling even handed in-depth explanation, that holds up well against the other competing theories on the subject.
No doubt that the success of an individual in our society is not entirely dependent on IQ. However, since Binet developed the concept and means for determining IQ 100 years ago it has proven to be a reliable predictor of an individual's potential for achieving success.
There have been many theories as to why races have different physical characteristics, abilities and traits and why some have progressed and others have not. Most convincing to me is discoveries brought about by the mapping of the genome and subsequent worldwide sampling of DNA which has proven that certain gene mutations occurred in some races and not in others and that this likely accounts for differing levels of intelligence
If you take a look at some recent scholarly literature on the subject you will find that there is a proven correlation between average IQ and the health and prosperity of a people or nation. There are multiple studies conducted my credentialed professionals and academics in disciplines, such as genetics, paleontology, psychology, economics, sociology and statistics that confirm this. You will also find that the flaws in IQ measurement you elude to have been addressed by improvements in testing methodology and analysis. I have posted information on several of these studies.
You don't have to rely on the analysis of others if you are not persuaded. For instance, can you tell me what contributions to the advancement of mankind has come out of sub-Sharan Africa? Can you name one city that could be considered as such present in this region prior to the Europeans arriving. There was no writing and no system of numbers. There were no words in the various dialects to describe numbers beyond one, two and many. How is South Africa doing since the beginning of black rule and whites leaving the country in large numbers. How about Zimbabwe. The average IQ among blacks in this region is 70. Northern Africans/Arabs have an average IQ of 85.
Historically, the vast majority of immigrants to the U.S have been from Europe and north Asia and not from Africa, the Middle East or South Asia. (The Chinese and other north Asian peoples have a slightly higher average IQ than North American and European caucazoids, e.g 100 vs.103) I am pointing this out not to denegrate any particular race but simply to say that we should be cautious about bringing into our country large numbers of people who do not possess the intelligence to compete successfully and contribute positively in our country and/or who are unlikely to adapt to our culture.