What were the great civilizations that were also isolationist? I've been watching Sir Kenneth Clarke's art history series:
>https://en.wikipedia.org/wiki/Civilisation_(TV_series)
He discusses western art and architecture, starting at the end of the Dark Ages.
He makes the point in one episode that the greatest leaps forward and triumphs of civilization occur during periods of internationalism, as opposed to isolationism.
This view strikes me as being very accurate. Bronze Age civilisation, at its height, consisted of various globalized kingdoms and empires.
https://www.youtube.com/watch?v=bRcu-ysocX4&t=3434s
The Renaissance, with the arrival and explosion of Humanism, was the beginning of internationalism in Europe. One of the mottos of Humanism was "Homo sum, humani nihil me alienum puto", meaning "I am a human and consider nothing human alien to me".
So, is isolationism the enemy of civilization? It definitely seems that way.