Out of the gate, genetics. Genetically homogeneous cultures would be much easier to provide healthcare to, because you have less diversity of outcomes for treat

Out of the gate, genetics. Genetically homogeneous cultures would be much easier to provide healthcare to, because you have less diversity of outcomes for treatments. If there is genetic predispositions to life expectancy, and I'm not saying there is per se, only that it's plausible, the more genetically diverse your country is, the closer to the mean life expectancy you would be, and homogeneous countries would effectively be a form of life expectancy data-mining. I could further get into discussions of negative outcomes as governance population size increases, but that's a much more speculative discussion. I would say that in smaller countries, where you're much more likely to know someone who is a friend of your representative, you'll have better long run outcomes of governance because you can govern much more pragmatically and less ideologically.