Romania has very similar ethnically homogenous population at 89.3% [1] and I can definitely say that this factor does not directly lead to a high trust society.

Romania has very similar ethnically homogenous population at 89.3% [1] and I can definitely say that this factor does not directly lead to a high trust society. I suspect there are quite a few other countries with similar makeups that don't result in outcomes similar to Finland/Japan. While homogeneity may play a factor I think it's dwarved by other things. [1] https://en.m.wikipedia.org/wiki/Demographics_of_Romania https://en.m.wikipedia.org/wiki/Demographics_of_Romania