Final answer:
Alexander the Great's most influential accomplishment was the spread of Hellenistic culture, resulting in advancements in various fields and military strategies that still impact us today.
Step-by-step explanation:
Alexander the Great's most significant accomplishment that influences us today is his spread of Hellenistic culture throughout the conquered territories. This cultural diffusion resulted in the blending of Greek and local traditions, fostering advancements in art, architecture, literature, and philosophy that continue to shape the world today.
Additionally, Alexander's military tactics, particularly his innovative use of combined arms and rapid maneuvering, have influenced military strategies to this day. His empire also established trade networks and communication routes that connected different regions, facilitating cultural exchange, economic growth, and technological advancements.
Learn more about Spread of Hellenistic culture