Indeed. My grandfather used to tell me tales of his day in the Civilian Conservation Corps, building roads in the southern end of the Appalachian Mountains in the 1930s.
They'd be going along clearing out land for a road and they'd come across a hollow with residents who had been isolated for decades, if not a century or more. He said they knew nothing about the world at all, though they would have basic tools from way back. Of course, that was 80 years ago now.
In general they were mistrustful of outsiders and didn't want anything to do with them. Most of them weren't happy about the new roads (these would have been very basic dirt forest-service style roads at the time). They lived in very simple shacks, and of course had no electricity or running water.
Only vaguely related, but after his time in the CCC, my grandfather became a pentacostal preacher, which he remained for the rest of his life. His first "church" was a brush arbor he built himself. Funny how different life was then.
They'd be going along clearing out land for a road and they'd come across a hollow with residents who had been isolated for decades, if not a century or more. He said they knew nothing about the world at all, though they would have basic tools from way back. Of course, that was 80 years ago now.