> If less than what you would expect from two non-correlated random variables, this suggest where you start in life has an effect of how far you can go.
Where you start in life is not independent of innate traits.
If, for example, things like impulsiveness and self-discipline (cough Conscientiousness cough) have high degrees of heritability, it can be simultaneously true that one's birth place correlates with one's destination and it also be the consequence of one's own chosen behavior. (And to the extent that the environment is equalized and optimal, genetic factors will matter more, not less.)