The city-states were groups of cities united under a single government. The city-states were often at war with one another.
All people in Sumer were equal and elected their own government officials.
The Tigris and Euphrates rivers were important to Sumerian city-states.
The people of Sumer worshipped the same god.

Explanation:

1: False, each city state had a different government presiding over each

2: True, they fought each other for farmland often

3: False, their government was a *Theocracy, not a democracy. And not all were equal either.

4: True, as they relied on farming heavily.

5: False, the Sumerians had thousands of gods

Hope this helps!

* A Theocracy is worshipping a god king, and is not an elected official.

your answer would be a) no nation can be economically self-sufficient.

stay in school!