How does 65000 workers translate to millions of unskilled relatives? Even green cards for relatives are a nontrivial process.
Also case in point, both me and my wife went from F1 to green card. We never worked illegally and had fully funded gradute programs. Our parents refuse to settle in the US, they have assets and families in home countries and rather live there. We haven't tried to bring in any other relatives. 3 of our siblings have also went through the F1 route, all of them fully funded gradutes, one of them left the US after graduation, other two settled and got green card.
In my case, spouses are siblings are all skilled workers, and we have not sponsored each other.
We have one kid, even he is advanced for his age in terms of reading/math.
Each legal immigrant who becomes a citizen is the root of a tree that can continue indefinitely. If you come from anywhere other than India or China, it takes about 10 years to get citizenship from when you get your H1B. It took us less than 10. After that you can sponsor family for green cards directly. That person only needs about 6 years before they can get citizenship and start sponsoring their own family members. So it’s easy to see how we went from 10,000 Bangladeshis in the U.S. in 1990 to 300,000+ in just 35 years.
That’s very easy within a few decades when you consider that the people who are sponsored will get citizenship and can then sponsor their own parents, siblings, etc. My dad sponsored six people, and he just has one brother. My mom has 12 siblings, but them and their families went to Australia following my uncle.
There are 300,000-600,000 Bangladeshis in the U.S., up from under 10,000 in 1990. Based on H1B petitions and natural growth, the population should be more like 15,000. People are bringing their entire extended families over.