"...we now know that the area between Mesopotamia and India spawned a host of cities."
They'll eventually trace it all back to Sundaland.
It didn't become a barren wasteland until around 627AD.
So they were pretty “advanced” 5000 years ago - then 1400 years ago they slid backwards, and have hardly come up for air yet!
Not to be a nitpicker, but that “Land of Magan” looks to me to overlay modern Oman, not the UAE.
And that makes a lot of sense to me as the Batinah region of Oman is agriculturally productive in a way not seen in most of the arabian peninsula, and could have supported a considerable population in ancient days as a fresh water lens is just within reach in normally dug wells in may places along this coast.
This is to say nothing of the significant inland oases which are also agriculturally productive.
And copper, you say? Well, that comes from the mountains just inland from Sohar, the major city of the Batinah and the legendary home of Sinbad the Sailor.
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