How did founding cities by Alexander the Great ensure Greek?

Alexander the great founded cities, often named after himself, throughout his conquests to spread Greek culture and influence. These cities served as centers of Hellenistic civilization, promoting Greek language, arts, and governance. By establishing administrative and cultural hubs, he facilitated the integration of Greek practices with local customs, ensuring the lasting impact of Greek culture across his empire. This strategy helped to create a shared identity that blended Greek and local elements, reinforcing the spread of Hellenism.