Cyrus is viewed as a tolerant ruler, while Sennacherib is viewed as a cruel one
The answer is Genocide, genocide is the killing of a large group of people, especially those of a particular ethnic group or nation.
Sometimes they figure out how to build better shelters or learn better farming and hunting techniques for the environment they live in
Advantages:
Natural barriers
Powerful empire
Protection from enemies
Resources
Disadvantages:
Living in tall mountain range
Elevation sickness
Traveling is dangerous
