The clearest finding was that the more diverse the area, the less people trusted each other.
I grew up in Hawaii, arguably one of the most racially and culturally diverse populations in the world. As an adult I've lived in 10-15 cities on the mainland and none of them had as much warmth and acceptance in the culture as Hawaii does. If I had to pick one reason for that, I'd say it is because Hawaii has less correlation between race and wealth than most places in the US. Still not completely egalitarian, but closer.
If I had to pick one reason for that, I'd say it was because Hawaii is an island. Island cultures are notoriously laid back and friendly around the world.
I grew up in Hawaii, arguably one of the most racially and culturally diverse populations in the world. As an adult I've lived in 10-15 cities on the mainland and none of them had as much warmth and acceptance in the culture as Hawaii does. If I had to pick one reason for that, I'd say it is because Hawaii has less correlation between race and wealth than most places in the US. Still not completely egalitarian, but closer.