So one of my projects right now is set in a country that has been isolated for somewhere between 200 and 400 years. (Time to be solidly decided once I figure out what's realistic for their level of development.) It's based in Anglo-European culture and has ~1200s-level tech when they're first isolated. The country has magic (in fact, it's the only country in its world with ~10% magic users as opposed to ~.01%).
There's still some passage in and out of the country -- out, mostly -- but there's almost no trade and no significant communication with the outside world. The most it knows about its nearest neighbor (a collapsing empire) is that it's undergoing a violent revolution, because a handful of refugees came to them 20 years ago. Full stop. They aren't interested in anything about the outside world, and they're protected by a magical border/barrier that repels anyone and anything they don't want getting in.
I guess my question here is: What real-world cognates would there be to this kind of isolation? Is there a way to realistically estimate how far tech would have come in 200 to 400 years since isolation, without outside trade or communication?
One of the countries in the world has developed steam power, gunpowder as a weaponry tool, and advanced medicine (for the time period, like inoculation etc.) by the time the border comes down. Assuming they were slightly ahead of Country #1 when the border went up, what would be a realistic time frame for that? I was thinking ~400 years for steam power and widespread inoculation, but I know that gunpowder (and early inoculation) came much earlier than that.
Any ideas? Discussion? I'd be glad to hear anything.
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