in 323 BC, Alexander the Great died of typhus

The Greek Macedonians left part of their troops to control the territory and also left behind the wounded of the war, after which the assimilation of the Greeks among the local population occurs, and in my opinion these same Greeks are the distributors of Hellenistic culture in Central Asia

This is what was associated with the spread of Greek culture in Asian states; under the order of Alexander the Great, several military cities were built for the safety of the army