To quote Wikipedia, which is not biased in favour of race science:
> A 2001 meta-analysis of the results of 6,246,729 participants tested for cognitive ability or aptitude found a difference in average scores between black people and white people of 1.1 standard deviations. Consistent results were found for college and university application tests such as the Scholastic Aptitude Test (N = 2.4 million) and Graduate Record Examination (N = 2.3 million), as well as for tests of job applicants in corporate settings (N = 0.5 million) and in the military (N = 0.4 million).
I don't actually think it is controversial that there are IQ differences between ethnic groups. What is controversial is (a) how much IQ means, is it a good measure, etc. and (b) are the causes of these differences genetic or environmental.
https://en.wikipedia.org/wiki/Race_and_intelligence