>I think they would find neighbors very welcoming - even the toughest cities and neighborhoods are mostly friendly people - but the culture would be unfamiliar and the newcomer would have to adjust.

Sure, I agree, with emphasis on the newcomer adjusting.

>I'm not sure where that is in many cities, other than suburbs. You can't escape the richness of large cities.

To clarify, I just mean locations that attract people of a wide variety of backgrounds. That is not to say those locations are 'un-rich' or anything. I just mean that interactions there are governed more by mainstream American culture than by anything specific to that city or neighborhood or the people involved.