This is only true in the context of selective immigration policy. If your immigration standards are high, you'll get exceptional people from everywhere. The US currently has no standards whatsoever (actually, the incentives are to discourage high skilled, law-abiding people from migrating) so that observation will quickly be obsolete.
This is only true in the context of selective immigration policy. If your immigration standards are high, you'll get exceptional people from everywhere. The US currently has no standards whatsoever (actually, the incentives are to discourage high skilled, law-abiding people from migrating) so that observation will quickly be obsolete.