Q: Are all racial groups as smart as each other?
A: I don’t know; how ‘bout we pull out the data from the last 75 years?
Minnesota Transracial Adoption Study
https://en.m.wikipedia.org/wiki/Minnesota_Transracial_Adoption_Study
In the 1960’s a group of adopted children were studied as they grew. All were adopted into white affluent families as babies, average parental IQ 120.
At 17, IQ tests were administered.
After growing up in white families, going to middle class schools, etc., and getting every possible environmental advantage, the black kids averaged IQ 89. White adopted kids, IQ 106.
I have not seen any further studies of this type.