The Persians first incorporated their neighbour Media, then use theis combined power to takeover adjacent territories, expanding progressively west to Asia Minor and Egypt and Libya in north Africa, north to Central Asia, and east to western India.
They left local government in place and established twenty provincia governors to reinforce this local authority, provided external security and oversight from the king and his council.
Cyrus the Great.
King Darius the Great.
Local government, controlled by PERSIAN provincial governors with central control by the king and his council.
Local government by cities, tribes and princelings; Persian provincial governors; acentral control by a king and his council.
Lack of communication throughout the empire/society/etc. would definetely be one of the major difficulties to taking control of a large empire/society/etc. Another would be travel. "How would they get around?" would be a good question for that. Simple difficulties such as these can lead to the fall or decline of an empire,nation,etc.
Cyrus the Great.
The Persian Empire covered many countries, but was primarily based and organized in the modern state of Iran.
Darius I.
King Darius the Great.
The Persian Empire was organized into 20 provinces (satrapy) with a Persian governor (satrap) who had the military resources to maintain peace and to protect the borders. They also collected taxes. Within their satrapies they allowed local government to continue according to local custom. The satraps were responsible to the king and his council, who provided overall directions and command.
The king.
a. There was no organized government.
The governing system of the Persian Empire, resting on traditional local government, provincial government and central imperial government.
Local government, controlled by PERSIAN provincial governors with central control by the king and his council.
Imperial
A king and his council, Persian provincial governors and local government.
Askia Muhammad