> A core strategic strength of the US over the last century has been that everyone with any talent wants to come here to work, and by and large we’ve let them do so.
That's largely a myth, though. The vast majority of smart, driven people have no path to lawfully immigrate to the US.
By a wide margin, the main immigration pathway are family visas (i.e., marriages and citizens bringing in relatives). H-1B visas are a comparatively small slice that's available via a lottery only to some professions and some backgrounds - and the process is basically gamed by low-wage consultancies, with a large proportion of the rest gobbled up by a handful of Big Tech employers. And that's before we even get to the fact that H-1B doesn't necessarily give you a path to permanent residency, depending on where you're from.
For most people who aren't techies, the options are really very limited, basically "be exceptionally wealthy", "be a celebrity", or "be one of the world's foremost experts on X".