Why do you say that "ancient Greek civilization is the product of the fusion of eastern and western classical cultural relics"?

Ancient Greek civilization itself is the source of western culture, and in its development process, it has also continuously expanded its cultural scope, including colonization to the East. At the same time, there are conflicts with the East, such as the Trojan War in Homer's epic and the Greek-Persian War in its heyday. Finally, Alexander, the outstanding Greek leader, led the Macedonian army eastward, established a great empire, promoted the exchange and integration of eastern and western cultures, and finally formed such an ancient Greek civilization of "the integration of eastern and western classical cultures".