Answer:
Sumer, located in Mesopotamia, is the first known complex civilization, developing the first city-states in the 4th millennium BCE.
Explanation:
Factors that made construction of infrastructure difficult in
the Northeast There was little help from government. In terms of geography, the terrain was rough
and jagged with lots of twists and turns.
There was also opposition from competitors who saw the new transport
systems as a threat to their business.
C. The prices of crops increased, which caused farmers to overuse their lands and ruin the topsoil.
Remember the Dust bowl was happening at the same time
