Common Law Mechanisms - What Kind of Communities Exist?

What sort of communities and models already exist that could become the axis for a new private, hopefully, or semi-private system after some sort of dissolution of these big Western states? What can we learn from communities like the Amish and the Mennonites in portions of the US Midwest? "We don't have to reinvent the wheel," he says. 'A lot of what we think of as the Greece that makes a good or happy society possible'