"All in all, though, I think it wise to hold yourself responsible for your accomplishments - both geographic location and your circle of acquaintances is something you have significant control over." I agree in spirit, but the reality is different.
Yes. -if you're a white/asian male -born to middle class parents -and you're parents emphasized education -and good nutrition/genes so that you grow to above average height -and that you go to a good college -and can fit in with the right crowd yes, you simply move to silicon valley/manhattan/london and fit right in. IF you're a black man from a poor single parent family in small town mississippi, or the daughter of a farmer from a village in bangladesh, things are much more difficult.