I believe the answer is: <span>desert, hot, rugged
This climate made the region have insufficient water to sustain a lot of people and make it really hard for many agricultural crops to grow.
Because of this, not many populations able to survive in this area and many of them choose to migrate to another place.</span>
I really agree with your statement
<span>naturalistic observation
hoope it's help:)</span>
Two treatises of government