Plausibility Check: Rome reigned longer, yet isolated herself.

So, how can the Roman Empire have a prolonged reign, while remain closed towards foreign world? Bonus for having it never divided, and another bonus for reigned for another thousand years.
 
I don't get the OP, giving I don't really see how it can be considered as "closed to foreign world".
Also, don't bump when you didn't have answers for only 30 minutes.
 
Multi-cultural empires that heavily engage in trade far beyond their borders generally don't close themselves to the outside world. The very geography of the Empire precludes it.
 
I get the sense that you're going for a China analogue. The problem with that is that Rome's geography makes it nearly impossible for it to isolate itself.

Look at China: Mountains to the south, a desert to the west, frozen tundra to the north, one coastline.

Now look at Rome: Open plains to the north and east, multiple coastlines, access to the Atlantic and Indian ocean.

China could easily seclude itself by building a wall to the north and stationing some troops. Rome can't do that. Its northern border is way too large and easy to cross.
 
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