Explain how Alexander the Great built an extensive empire.

Alexander, conqueror of the Persian Empire, was one of the most important military in the ancient world.

Alexander stood out for his tactical brilliance and the speed with which he crossed large territories. Though brave and generous, it was cruel when the political situation demanded it. He committed some acts he regretted, such as the murder of his friend in a moment of drunkenness. As a politician and leader, he had grandiose plans. According to some historians, he has devised a project to unify East and West into one world empire.

To unify his achievements, Alexander founded several cities throughout his territories, many of which were named Alexandria in his honor. These cities were well-situated, well-paved, and had a good water supply. They were autonomous, but subject to the king's edicts. The Greek veterans of his army, as well as the young soldiers, merchants, traders, and scholars, settled in, taking with them Greek culture and language. Thus Alexander broadly extended the influence of Greek civilization and paved the way for the kingdoms of the Hellenistic period and for the later expansion of Rome.