Final answer:
Alexander the Great's most significant contribution to history is the spread of Hellenistic culture, which fostered advancements in arts, science, and led to the Greek language becoming widely used across numerous regions.
Step-by-step explanation:
Hellenistic culture :
Alexander the Great's most lasting contribution to world history was the spread of Hellenistic culture which significantly shaped subsequent cultural and political developments across a wide region. The effects of the Hellenistic period instigated by Alexander are profound. His conquests merged Greek ideas with the customs of the Persian Empire and beyond, leading to advancements in arts, science, and philosophy. New cities founded by Alexander, such as Alexandria in Egypt, became centers for learning and cultural exchange.
Alexander’s military strategies and tactics themselves had a lasting impact, studied and admired by future generations of military leaders. However, it is the Hellenistic period’s influence on culture and knowledge exchange that stands out as his most significant contribution, helping to shape the cultural landscape of the Mediterranean and Asian territories for generations.