We just need a much tougher citizenship requirement. Proactively hunt down illegal migrants, and the companies that employ them. If you want citizenship, you need to pass a tough exam and pay a lump sum to pay into the social securities you want rights to. Minimum wage workers are useless, they end up sucking up more benefits and eat up housing, than they put into the system. Add a remittence tax. Maybe create some foreign worker savings fund they can only cash out once they're out of the country.
Regression to the mean will happen with the above average, it doesn't happen every generation, but it's going to happen as modern society made sure life was not really a lethal IQ test. Also the politics get cancerous if you just import non-white elites. We really can't currently co-exist with nons long-term.
It's better to just increase your own population. Why import non-whites, when we can just do eugenics and multiply the far-right side of our bell curve? If we get gamete donors from g loaded occupations (especially if their family is g-loaded), make embryos and get average families to incubate and raise these embryos. Having an adopted gifted child will be a great investment as they can leech off their future success.
I can already go to a sperm and egg bank, and make an embryo with an IQ that's 120+ (It's DIY) I found a donor of NW euro descent whose attractive, 5ft 10 (good enough), SAT implies 130+ IQ (Now a shit proxy sadly). grad degree in physics. Accelerated learning. Dad is a dentist, Mother is a molecular biologist, brother is a fighter pilot which are all g loaded occupations.
Egg donor kinda sucks, masters of biology. Gifted Stacey needs to step it up, they aren't really being egg donors.
Bam, I can't compete against gifted chad nor Stacey as an above average midwit. But I can contribute to society and my race greatly by cucking out and multiplying the far right side of our bell curve to get shit done.
IQ/g is a real thing, it got extra validated by polygenic scores, which confirmed that professional IQ tests would test a populations average raw intelligence. For an individual, you'd take multiple professional tests and average the scores to get something close to your actual g.
It predicts a lot. Most European's average IQ is above their Iron age ancestors.