Short version:

[From page 268](http://www.udel.edu/educ/gottfredson/30years/Rushton-Jensen30years.pdf):

>Matching Black and White children for the geographical areas of their homes, the schools they
attend, and other finer grade socioeconomic indicators again reduces the mean
group IQ difference but does not eliminate it. Black children from the best areas
and schools (those producing the highest average scores) still average slightly
lower than do White children with the lowest socioeconomic indicators (Herrnstein
& Murray, 1994, pp. 286–289; Jensen, 1998b, pp. 357–360).

Similar findings have been shown for SAT scores, which correlate highly with IQ. [Black children of parents with graduate degrees have lower SAT scores than white children of parents with a high-school diploma or less.](http://lagriffedulion.f2s.com/testing.htm)

Further, LSAT score analysis by race and SES reaches the same conclusion. Extremely rich black students have similar educational scores as extremely poor white students. [Relationship of race socioeconomic status to undergraduate GPA LSAT score](https://i.imgur.com/bUzN9vV.jpg)

30 years of research on race differences in cognitive ability, based on multiple categories of evidence and dozens of research studies with thousands of research subjects, all converge and agree upon the indisputable fact that Whites and Blacks have different average levels of general intelligence. This remains true despite controls for poverty, health, education, and many other possible factors. The average White IQ is roughly 100 while the average Black IQ is roughly 85. This gap has been demonstrated repeatedly by every race and intelligence study ever conducted in every state, county, and school board and the same White-Black ratio has remained relatively constant since testing first started decades ago to the present.

The evidence is so overwhelming that psychologists do not even attempt to argue that the massive gap does not exist, the only debate on the subject is what the exact cause is.

And look at [the source I posted for obesity](http://www.ibtimes.com/heres-how-obesity-relates-gender-race-income-us-charts-1469056). It controlled for poverty. The disparity, again, remained.

Interesting stuff, huh?


Long Version:

Sowell is wrong as is Flynn. Environment as little bearing on IQ. The Flynn Effect has stopped since the early 90s.
Jon Martin Sundet and colleagues (2004) examined scores on intelligence tests given to Norwegian conscripts between the 1950s and 2002. They found that the increase of scores of general intelligence stopped after the mid-1990s and declined in numerical reasoning sub-tests.[35]
http://en.wikipedia.org/wiki/Flynn_effect#Possible_end_of_progression[1]
"Despite popular assertions, a single factor for intelligence, called g [or "general intelligence"], can be measured with IQ tests and does predict success in life"
http://www.udel.edu/educ/gottfredson/reprints/1998generalintelligencefactor.pdf[2]
Higher IQ correlates well, often as the best predictor, with job performance (>.90), wealth, income, economic growth, liveability in a US state (.80), http://www.ncbi.nlm.nih.gov/pubmed/17032488[3]
, cooperation, life expectancy (.85) and infant morality (-.84), http://ije.oxfordjournals.org/content/35/3/665.abstract[4]
,http://www.udel.edu/educ/gottfredson/reprints/2004currentdirections.pdf[5]
30 years of research on race differences in cognitive ability, based on multiple categories of evidence and dozens of research studies with thousands of research subjects, all converge and agree upon the indisputable fact that Whites and Blacks have different average levels of general intelligence. This remains true despite controls for poverty, health, education, and many other possible factors. The average White IQ is roughly 100 while the average Black IQ is roughly 85. This gap has been demonstrated repeatedly by every race and inteligence study ever conducted in every state, county, and school board and the same White-Black ratio has remained relatively constant since testing first started decades ago to the present.
http://i.imgur.com/V8ES9yO.jpg[6]
http://i.imgur.com/eGxiTqI.jpg[7]
The evidence is so overwhelming that psychologists do not even attempt to argue that the massive gap does not exist, the only debate on the subject is what the exact cause is.
The Minnesota Transracial Adoption Study tested the IQs of Whites, Blacks, and Mulattoes (half White and half Black) that were adopted into White upper-middle class homes. The study tested the adopted children's IQs at the age of 7 and there was a 10 year follow up when they were 17. The study is important because despite the fact that some of the Mulatto children considered themselves fully Black and that society considered them fully Black, they scored in between the White and Black children; 109 for adopted Whites, 99 for adopted mulattos, and 89 for adopted Blacks.
This shows that despite having the same environment (adoption into upper-middle class White families) the higher the White ancestry of self- and socially-percieved Blacks, the higher the IQ. This study completely shatters the notion that "Racism" or "Black culture" is the cause of the IQ gap as these same social constructions would effect the Mulatto children (who considered themselves fully Black) as well as the Black children.
http://psycnet.apa.org/?fa=main.doiLanding&uid=1992-34580-001[8]
Despite both being considered Blacks by society (one-drop rule) lighter skinned Blacks score consistently higher on IQ tests than darker skinned Blacks.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2906346/[9]
The heritability of IQ increases into adulthood, at 42% for ages 4-6, 55% for 6-20, 80% for adult Whites
http://psycnet.apa.org/?fa=main.doiLanding&uid=1992-34580-001[10]
And 72% for adult Blacks. http://psycnet.apa.org/journals/law/11/3/406/[11]
Despite arguments that poverty in the Black community is the cause of lower intelligence, Blacks from high socioeconomic status homes have a lower average IQ than Whites from low socioeconomic status homes.
http://psycnet.apa.org/index.cfm?fa=buy.optionToBuy&id=1974-24027-001[12]
Modern science has found ways to remove cultural bias from intelligence testing. One example is by using Raven Matrices to measure intelligence.
http://en.wikipedia.org/wiki/Raven%27s_Progressive_Matrices[13]
In a Raven Standard Progressive Matrices test, the subject is tested with patterns and geometric figures which are culture-independent and a computer calculates the score.
Despite having no cultural bias, they continue to show the large, measurable, and significant intelligence gap between Whites and Blacks.
To date, despite claims that IQ tests are biased, not one single intelligence test has ever displayed equal scores for Blacks and Whites; one must either make the test so difficult that nobody can manage to get the questions correct or so easy that everyone obtains a perfect score to show testing equality, yet that would make the test meaningless and invalid.
Trillions of dollars have been spent in attempt to erase this Black-White IQ gapand all have failed.
In fact, "public schools now spend more per capita on black children than on white." Also, "Contrary to environmentalist predictions, intervention beginning at age three makes no difference to the intellectual development of blacks [into adulthood]."
Egalitarians often suggest that White racism lowers Black self-esteem and causes an inferiority complex. However, "Past research indicates that black adolescents consistently have higher self-esteem than white students. Other research demonstrates that self-esteem has positive effects on academic achievement. However, black students have lower academic achievement than white students while concurrently exhibiting higher self-esteem."
Blacks mature faster than Whites. This is part of the reason why IQ is able to change in children. IQ is heritable in children according to Jensen. It's possible to raise it in children but to quote Jensen, when they hit puberty, their genes "turn on."
The IQ gap reflects this; the gap is 0.7 standard deviation (1 SD is 15 points) at early childhood, 1 SD at middle childhood, and 1.2 SD into early adulthood.
About 37% of Blacks have an IQ below 80, while only 9% of Whites do. Blacks are 6x as likely to have an IQ of 70 or less as Whites, 12% of Blacks compared to 2% of Whites. Half of Whites have an IQ over 100 (average) but only 16% of Blacks do. Only 1% of Blacks have an IQ over 120, but 9% of Whites do.
http://www.lagriffedulion.f2s.com/retard.htm[14]
The DTNBP1 gene has also been linked to intelligence, specifically the rs:760761, rs:2619522 and rs:2619538 alleles. For rs:760761, 18% of Whites carry the T allele, which takes off 8 IQ points, compared to 37% of Blacks. For rs:2619522 carrying the G allele takes off 7 points, and is found in 18% of Whites and 35-36% of Blacks. The rs:2619538 T allele increases IQ by 6.5 points and 61% of Europeans carry it vs 67% of Blacks.
http://www.behavioralandbrainfunctions.com/content/3/1/19[15]
The children of wealthy black parents with advanced degrees score below poor whites on the SAT and the LSAT. Only 61% of blacks pass their state's bar exam on the first try, whereas the passing rate for whites is 91%. Only 58% of blacks pass Step 1 of the US Medical Licensing Exam on the first try, whereas the passing rate for whites is 93%.
2008 SAT scores by race by income[16]
Racial Amplitudes of Scholastic Aptitude[17]
These score gaps could be interpreted as white admixture tests. White students have SAT score advantages over all non-Asian minorities. The gaps shrink in order from African Americans to Hispanic Americans to Native Americans to “other” race students. This order seems to correspond to white admixture (African Americans: 22%, Hispanic Americans: 48%, Native American: 50-60%). Granted, those admixture estimates are debatable, and I am reluctant to draw strident conclusions related to the small, fluctuating number of students who call themselves Native-American on the SAT, let alone “others.”
1995 SAT scores for the races in the US, by family income and parental education -- privileged blacks score at same level of EXTREMELY disadvantaged Whites[18]
Extremely rich black students have similar educational scores as extremely poor white students:
Relationship of race socioeconomic status to undergraduate GPA LSAT score[19]
http://www.jbhe.com/features/49_college_admissions-test.html[20]
30 Years of Research on Race Differences In Cognitive Ability by Rushton and Jensen, affirming amongst other things the huge IQ gap between blacks and whites and how IQ is correlated with scholastic and real life (socio-economic) performance [PDF, 50 pages][21]
Black children of parents with graduate degrees have lower SAT scores than white children of parents with a high-school diploma or less.
STANDARDIZED TESTS: THE INTERPRETATION OF RACIAL AND ETHNIC GAPS [22]
Of all group differences, the best studied is between whites and blacks. The black-white gap is also the most reproducible, the black mean lagging behind the white by about one standard deviation. Consequently, we can estimate the black distribution by shifting the white distribution to the left by 1.0 SD, as in Figure 2. When we do this, the area representing the failing fraction increases to 0.75. That is, if whites fail at the rate of 37 percent, a black-white gap of 1.0 SD implies that blacks will fail at the rate of 75 percent, in agreement with their observed failure rate in Waco. Thus, the Waco school district results for blacks and whites were consistent with standardized test results observed universally. (Details of the calculation are given in Appendix A.)
SAT scores correlate highly with IQ.
http://www.nytimes.com/roomfordebate/2011/12/04/why-should-sats-matter/the-sat-is-a-good-intelligence-test[23]