Although I agree with the science behind the Last City being located in Chile, I always felt the cultural element doesn't support that. We see clear preservation of various cultures within the Last City except Chile and native cultures, Festival of the Lost aside (and even then, that's a stretch).
Mulling it over, it seems native villages would have a high survivability rate due to lack of interplanetary tech sought by the Eliksni, unity of the community, regular use of localized resources for survival, and possession of firearms and other weapons/strategies for self defense. That being said, there is either a plot hole in D2, there was another genocide within D2 during golden age that isn't mentioned, or Chile isn't the location of the Last City
Many may not care about this but it would definitely add to the scope of the D2 world and lore.
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That's actually a very interesting subject. I think the only problems that might arise is how native cultures would be represented in game and getting all that done in a way that looked right. Plus the point seemed to kind of be to have us not know exactly where the last city is. Very interesting thing to think about though.