The ""communities""" you talk about are an old fashioned concept that don't really exist anymore. For context, in most big cities, a "community" would consist of 60-80% immigrants, expatriates, seasonal workers and more types, with the minority being the ""locals"". So this is a non starter anyway. Remember that in smaller communities, newer folks would not want to fit in anyway. They would prefer to form their own tribe. Nation States as we know it are dying a slow, but sure death. It's only a matter of time as they decay and rot...