Final answer:
Athens and Sparta fought in the Peloponnesian Wars, a series of conflicts lasting 30 years from 431-404 BCE.
Step-by-step explanation:
The Athens and Sparta fought for 30 years in the Peloponnesian Wars.
The Peloponnesian Wars were a series of conflicts between the two major Greek city-states, Athens and Sparta, from 431-404 BCE. These wars were fought primarily over power and influence in Greece, with Athens being known for its maritime empire and Sparta for its military strength.
During the Peloponnesian Wars, Athens and Sparta were the main adversaries, with other Greek city-states choosing sides. The conflict ultimately weakened both Athens and Sparta, leading to the rise of Macedon under Alexander the Great and the end of Greek independence.