Ancient history

What way did new understanding of the term Greek help to unify Hellenistic world?

The spread of Koine Greek:

Prior to the conquests of Alexander the Great many distinct varieties of Greek coexisted. Greek people could only fully understand other greek people that spoke their same variety. However during Alexanders campaigns a simplified common version of the Greek language emerged this version become what was widely spoken among educated circles around the Eastern Mediterranean and beyond was what scholars now recognize as Koine Greek.