Which was the most important lasting impact of Alexander’s conquests?

One could argue that the most important lasting impact of Alexander's conquests was the spread of Greek culture, known as Hellenization. Through his conquests, Alexander spread Greek language, customs, and ideas across the vast territories he conquered, which included parts of Greece, Egypt, Persia, and India. This led to a cultural fusion known as the Hellenistic period, where Greek influence blended with local cultures, leaving a lasting impact on art, architecture, philosophy, literature, and science.

The Hellenistic period also facilitated the exchange of ideas and knowledge between different regions and cultures, contributing to advancements in various fields. The foundation of numerous Hellenistic cities, such as Alexandria in Egypt, became centers of learning and intellectual pursuits. Scholars, philosophers, and scientists from different parts of the conquered territories came together in these cities, leading to the development and dissemination of new ideas and discoveries.

The spread of Greek culture also laid the foundation for the later Roman Empire, which adopted many aspects of Greek civilization, including art, literature, and political structures. Roman civilization, in turn, heavily influenced Western culture and played a crucial role in shaping the development of Europe.

Overall, the cultural and intellectual expansion brought about by Alexander's conquests left a lasting impact on the world, significantly influencing subsequent civilizations and shaping the course of history for centuries to come.