Which city-state was known as the leader of the Delian League?

Athens was the leader of the Delian League, which was established following the Persian Wars in the 5th century BCE. The primary purpose of the league was to create a collective defense against potential Persian aggression and to ensure the security of the Greek states that had participated in the struggle against Persia. Athens emerged as a dominant power within the league due to its naval strength and significant resources.

As the leader, Athens not only provided military protection but also controlled the financial contributions from other member states, often using these funds to enhance its own naval fleet and engage in various building projects, including the construction of the Parthenon. The Delian League eventually transformed into an Athenian Empire, illustrating the city's growing influence and power during the Golden Age of Athens, particularly under the leadership of Pericles.

In contrast, the other cities mentioned—Sparta, Thebes, and Carthage—were not part of this league and did not hold the same leadership role in this context. Sparta was known for its military prowess and leadership of the Peloponnesian League, while Thebes played a significant role later in Greek history, especially during the Theban hegemony. Carthage, located in North Africa, was a major power