Why is the Amish a subculture?

The Amish generally independently rule over their own selves, with elders being the power that be, over the Amish members.

It is small net work of communities, that general isolate themselves from outside society into nearby grouping of farms, and interact on daily bases among each other.

Despite the fact that they own large tracts of land, and they live in middle class housing, they live a very merger poverty line existence.

That there are laws on the books in both the USA and Canada, that treat them different than the common citizen, that Amish have swayed governments to treat them as subculture.