this association isn't one based in ignorance either...A la "the Gods Must be Crazy" All 4 civilisations mentioned above were the hub of developement in their respective arenas and times. The Japanese is by Me me due to the Physical isolation it shared with Egypt. Tho I allow that their interelationship with China was a little more complex, than the AEs' with any One of their neighbors.
Thanks for the reference


Warwick

" I have always found that the main obstacle to free
association on these boards is the broad
misconception that what we do not know is more
significant than what we do know."

Warwick L Nixon, March 8, 2019