Much of the companies/startup’s and vc’s are dominated by immigrants coming in from europe and asia. That ecosystem was fueled by immigrants before them. The only reason people seek out this geography is most global media attention is given here.
There is nothing special about US in itself that makes it lucrative for any one to stay. No wonder these calls of promoting local ecosystems in their original geography is heard again and again.
Maybe some point in time this was true, but not recently. There is a heavy focus on attaching labels to individuals, putting them in one camp or another. This kind of culture is hardly present or not as strong outside of US.
> There is nothing special about US in itself that makes it lucrative for any one to stay.
Aside from increased average wages, more amenable environment to starting businesses, a gigantic pool of natural resources, no (current and past) threat of military invasions or coups, and so on.
You're proposing that the only reason people immigrate here is because they heard about the US on the TV. We can argue whether it's "nicer" to live in Madrid or New York City, but most would-be immigrants and past immigrants came here to escape famine, impoverishment, oppression, and the like.
There is nothing special about US in itself that makes it lucrative for any one to stay. No wonder these calls of promoting local ecosystems in their original geography is heard again and again.