Question

What geographic factors led to the decline of Sumer?

Choose all answers that are correct.

A.
Grain fields of one city-state bordered those of another, which caused territorial wars.

B.
The cultivated soil had poor drainage.

C.
The Tigris and Euphrates rivers flooded every year, leaving behind dark, fertile soil.

D.
It was located in a flat plain, and isolated from trade routes.