Answer:
Desire for glory and more territory led to the outbreak of war among the Sumerian city-states.
They isolated themselves by building walls from hard and waterproof bricks.
Explanation:
Sumerian were the people who lived in the Southern Mesopotamia. The Sumerian city-states were formed when each city and land around it were separated from the larger unit.
The Sumerian city-states went to war against each other due to the desire for glory and more territory. As city-states grew more wealthier and powerful, their was danger of raid from other city-states. To prevent such raids, city-states engaged in war with each other, to become more poerful, wealthier, and have more glory.
These city-states isolated themselves from each other by building walls. They build for themselves thick and protective walls made by mixing of river mud with crushed reeds. This clay was the moulded in the shape of bricks, which made them hard and waterproof. Using these strong bricks, each city-states build for themselves thick and protective walls, and isolated themselves from each other.
