Answer:
The city-states changed in 2000 BCE as they became weak and easy to conquer by outsiders.
Step-by-step explanation:
A city-state controlled its towns and villages, but city-states fought with one another over resources and territory.
Around 2000 BCE, the region became weak due to conflict, which made it easy to conquer by others. The change implemented regarding the economy and government after the capture. People were allowed to work, trade and do businesses along with paying taxes. The rulers of the city-states became more powerful, began to exercise their authority over others, and established dynasties.