How was the administration organized under Alexander the Great?

During the reign of Alexander the Great, many territories were conquered. The emperor treated the population living there not as a conqueror, but as a ruler of their state. The Macedonian gathered near him nobility, brought her closer to him. For this nobility, he secured places in the army, as well as in the organs of power: the empire was divided into regions, the administrator of each of which was appointed by the Macedonian. This made it possible to control what was happening over a large territory of the country.