When one studies the ancient world, one of the most fascinating eras is the bronze age. There was a complex trading network between the civilizations around the Mediterranean trading goods. It was very modern in the sense that the separate civilizations were all able to trade with one another so each could get the resources needed, especially the copper and tin needed to make bronze. Tin was only found in a few places, and thus trade and commerce were needed to get that raw material to all who needed it.
A good starting place to get to know a little more about the bronze age collapse is this great lecture by Eric Cline.
For more information, his book is available on Amazon.
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