If we are talking about individuals each culture had then it is surely a coincidence, because we all know that such people made themselves more than anything. If we are talking about culture in general the year 500 is misleading because Greece had a great amount of culture afterwards and before, and so did China and India.
Incredible men like Socrates and Confucius existed everywhere in the world, because they made themselves who they were and in turn changed the world with their ideas. It is sad that only a few of these incredible men are known to us. I wish history was written better and there were less wars to destroy the important works of art in this world. Philosophy being the zenith of art of course.
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