It should be interesting to note that the Genetic Supermen of the Eugenics Wars are all considered to be from Eastern countries. Ruling through Asia, Africa, and it seems holding out in Australia. This somehow rings true with the Q presented post-atomic horror in what may have been China. If the last few devastating wars on Earth were fought in Asia, it make sense that the Westerners were the ones to do the rebuilding. If the large population deaths sited by Spock and Riker were also from said regions, it might also, roundabout, explain why their are less Asians represented among Star Trek's humans in general. Also why the penal colony is in New Zealand. And why Starfleet and the other humans seem more European/American in cultural background, even among those born in Africa or Asia.