Big city US and entrepreneurial mobility requires formalized interactions that rely less on trust. The high trust environments put a limit to outlier performance. They are clannish, rumor and reputation driven etc.
High trust environments are usually high trust inwards and low trust outwards toward outsiders who show up. They may show great hospitality but won't trust you with their affairs. Outlier entrepreneurial risk taking behavior only works in places that have medium-trust for everyone, by using contracts and other formal things.
High trust is incompatible with high mobility and "fresh starts". High trust is built when there's a way to retaliate and there is a way for reputation to spread. High trust among strangers only works if you can assume that the strangers are embedded in high trust networks that are in some way connected, even if you don't directly know each other.
If you can pack up and go anytime, trust will be lower. But for economic efficiency, being mobile is positive.
There are tradeoffs here. People didn't just become low trust randomly.