You're wrong. Some of the smartest kids I know are from immigrant children. It is their background - and society's response to that background - that hinders them, not their genetics. More so if they aren't lily white. Note how anything you say about this subject will be used to generalize to much larger groups (of which you can find some prime examples in this very thread) than the ones that IQ tests themselves target: individuals. And you can't say much about how an individual scores on their IQ test without accounting for their environment because that's a massive factor.

All of your arguments more or less equate to 'I don't understand the subject matter, but I'd like to see my biases confirmed'. And, predictably, you see your biases confirmed. But some of the smartest individuals that ever lived came from backgrounds and populations that - assuming the genetic component is as strong as you make it out to be - would have precluded them from being that smart.

Bluntly: wealth and access to opportunity have as much to do with how well you score on an IQ test versus what your genetic make-up is. Yes, it is a factor. No, it is not such a massive factor that it dwarfs out the other two once you start looking at larger groups. Income disparity and nutrition alone already negate it.

https://en.wikipedia.org/wiki/Effect_of_health_on_intelligen...

And that's just looking at that particular individual, good luck to you if your mom and dad were highly intelligent but you ended up as the child of drugs or alcohol consumers. Nothing you personally can do about that is going to make up for that difference vs growing up as the child of affluent and moderately intelligent people.

IQ tests are a very imprecise yardstick, and drawing far reaching conclusions about the results without appreciating the complexity behind squashing a multi-dimensional question into a single scalar, especially when you are starting out from a very biased position is not going to lead to a happy ending. Before you know it you'll be measuring skull volume.