Answer:
It showed rank
Explanation:
The Caste System was so important to ancient India because it showed rank.
Sumer had a surplus of "food", due to the fact that they were an agrarian outcome of the Neolithic Revolution. This meant that people could focus on other activities besides farming. <span />
There was little control over urban life, they also performed social services for the immigrants, and the cities needed the services they provided. They understood how to use the political system for their own good.
Because of the simple fact that they were the closest places to Europe.
