To unify these disparate cultures into a single civilization, Alexander established Greek-style cities across his empire and installed clever Greeks to run his empire for him. These cities became administrative centers, run by imported Greeks. To make the new Greek administrators feel at home, each city strove to be more Greek than Greece. In a relatively short time, Greek went from an obscure language, spoken in a tiny corner of the world, into the official language of an empire spanning some two million square miles. This process of spreading Greek culture and language is known as Hellenization and marks the beginning of the Hellenistic period.
In the end, Alexander did not get to enjoy the fruits of his empire for long. He never even made it home. Alexander died in Babylon, though our sources are not clear whether it was from poison, sickness or pure exhaustion. With no clear heir, Alexander's empire was in danger of collapsing as soon as it was formed. Alexander himself was of no help. On his deathbed, he bequeathed his empire 'to the strongest.' As no one was sure who this meant, Alexander's generals and kin fell to fighting among each other. In the end, Alexander's empire was divided into four smaller kingdoms: the Kingdom of Macedon, the Kingdom of Pergamon in Asia Minor, the Ptolemaic Kingdom of Egypt and far to the east, the Seleucid Empire."