Grain
Glass was traded as a surplus. They traded it for stone and wood
The Mesopotamians traded surplus wheat and barley.
What states where in the dust bowl
Yes
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The Mesopotamian traders shared ideas as well as traded
They traded items that the have a surplus of for items that they cannot get.
It provided a surplus of food which allowed the people to move on from a struggle for survival towards civilisation.
Each farmer had his or her own surplus, so what they had done is traded, lets say 3 cobs of corn for a basket of bread, and that is how everyone survived.
When they did traded they traded with other mesopatians or from the Persian empire...but they didn't trade much because each city was kind of like a state...they made what they needed and they weren't to friendly to other citites.
Um, It led to cultural diffusion because the surplus was traded with many cultures and soon other cultures wanted to use it as well.
In a dry area they provided the water to irrigate, and so provided the food surplus on which a civilisation can evolve.