What is a government ? why is it necessary for a state.​

Governments are necessary because they maintain law and order. Laws are necessary for society to function. A government is the system or group of people governing an organized community, generally a state

Explanation:

in 342 bc j._c. egypt fell into the hands of the persians, under the reign of nectanebo ii

greek city-states unite in a revolt against the persian empire at the beginning of the fifth century bc. j.-c  

from the year 660 or 659 bc ad, cyrus preached the revolt against the medes to deliver the persians.