I think educational infrastructure is almost a trailing indicator... Silicon Valley is special 'cause it prizes the sort of education required to do this sort of work. Especially when I first came here in the '90s, it was amazing - going from the place I grew up, where reading in public felt like it was risking physical violence (well, that's not really fair, I was 17) - to silicon valley, where that sort of thing was the sort of thing to do.