Final answer:
Alexander the Great is regarded as the greatest leader in uniting the Greek city-states during the Hellenistic Era. He succeeded where his father, Philip II, began, leading to a widespread influence of Greek culture and power.
Step-by-step explanation:
The leader who made a significant impact in uniting the Greek city-states was Alexander the Great. Tutored by Aristotle and driven by the ambition to surpass the heroics of Achilles, Alexander demonstrated his prowess as a warrior and strategic genius in various battles, including the battles of Issus and Gaugamela.
Kingly ambition to consolidate Greece began with Philip II of Macedon, who after the victory at the Battle of Chaeronea, sought to lead the Greek city-states. It was his son, Alexander the Great, who fully realized these ambitions by not only uniting the city-states but also extending the Hellenistic influence across Egypt and into Asia, establishing a legacy remembered for millennia.
Moreover, his leadership qualities extended beyond the battlefield, as evidenced by his ability to win the loyalty of both his Macedonian countrymen and those of the vast Persian Empire whom he conquered. His vision and accomplishments ultimately made him a figure of legend, worshiped by many and respected globally. Final answer: Alexander the Great is considered the greatest leader in uniting the different Greek city-states. He led expansive campaigns, which created a vast empire combining Greek and foreign cultures, especially following the defeat of Persia.