because the army can fight and conquer
Nitrogen
"Residential construction is the most important factor that underlies the growth of this market,"
It provided the core of its military power and so it's ability to take over the Babylonian empire and expand through Asia Minor and Egypt.
It constituted an immediately available high quality force to both impose control on territories which could not be gained by negotiation and bribery, and could deal with uprisings.
caste system
Some say that the beauty of the area is the most important factor in the growth of the Pacific Northwest. The area was also good for fur trapping.
Decreased Birthrate
A factor that limits the growth of a population.
Capital
The Great Migration
The high birth rate.
capital <3