I guess I’m referring to Indian and Chinese immigrants who come here with pretty much nothing and then through sheer hard work manage to become the richest demographics in the country.
I think you're saying that all hard-working immigrants succeed. But even I, as a non-American, have read stories of immigrants to the USA working 3 jobs and still struggling to pay the rent, let alone a mortgage.
Are they not working hard enough? If hard work alone was the predictor, why are there hard-working people struggling to pay for the most meagre of lifestyles?
Historically, even before the recent era, children of immigrants have been the most successful cohort.
And in particular the Asian immigrants have done outstandingly. For instance the median income of Asian households as well above that of caucasians, and has been for quite some time (I can't recall how far back).
The last few years may have favored immigrants more soundly but for the last 50 or 60 years that is not the case and they have still outperformed.