What sets the sumerian society apart from neolithic societies?

stewards ice box was the purchase of alaska from russia and it was called that because people thought it was not a good idea to purchase alaska

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.