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Persia.
they never joined forces
Pericles' decision to attack Sparta
Each had allies which augmented its power. Athens had an empire of about 180 city-states spread around the eastern Aegean Sea,. It had strong walls, which extended down to the sea, which enabled it to be resupplied during a siege. It also had a superior navy, which gave it the ability to threaten and raid opposing cities of the Peloponnesian League led by Sparta, and to ensure resupply of the city by sea from its empire. The Peloponnesian League had the strongest land forces, and was able to besiege Athens. By whittling don Athens' allies, it progressively reduced Athens' power and resupply, until finally after 27 years of fighting, the Athenian fleet was destroyed (Persia gave money to pay for a Peloponnesian fleet) and Athens was starved into submission.
Athens lost its empire. Sparta gained temporary ascendancy until defeated by Thebes 30 years later. Greece was devastated and weakened. Persia, defeated nearly a century earlier, was able to dictate a peace. Macedonia was able to exert hegemony over Greece, and defeat Persia.
Athens and its empire by Sparta and its allies, with financial support from Persia.
the macedonians of course... No, not the Macedonians. Sparta had many cities aligned in a league to defeat Athens, and some had formerly been Athenian allies who turned their coats because Athens treated them too harshly. Also, Sparta later formed an alliance with an old enemy, Persia, which continued to meddle in Greek affairs after their defeat by Sparta and Athens many years earlier. Persia gave Sparta money for a fleet. nobody helped them Yes, somebody helped them. They could not have done it without help, especially from the Persians and the Syracusans. Read the history.
Athens and Sparta did not fight each other in isolation. They fought as allies and as adversaries in various conflicts over a couple of hundred years. So Athens did not defeat Sparta or Sparta defeat Athens. They were involved in wider conflicts in the battles.
Persia.
The were not always enemies. They were when Persia invaded mainland Greece 480-479 BCE. Yet during the war between Athens and its allies and Sparta and its allies (431-404 BCE) the Persians provided the money for Sparta to raise a fleet to match the dominant Athenian one, resulting in Athens' final defeat. Necessity and opportunity make strange bedfellows.
The Peloponnesian War was between Athens and Sparta. It was after the great Persian war, when Athens and Sparta worked together to defeat Persia. The Peloponnesian War was started because Sparta feared Athens may dominate them one day. There was a big battle between them, lasting for many years, but in the end, Sparta won.
Alliances in Greece changed. For example several times Sparta and Athens fought on the same side, at others on opposing sides. Similarly at times Sparta and Thebes fought together, at other times were opponents. Generally Sparta was allied to other Doric city-states, though again this was not a hard and fast rule. And although Persia was usually an opponent of the Greek city-states, it was Persian financial support which enabled Sparta and its allies to get a competent fleet in the Peloponnesian War and defeat Athens.
Persia provided the funds for the Peloponnesian League to build and man a war fleet to match the hitherto superior fleet of Athens.
The peace treaties with Sparta and Persia in the middle of the 5th century BC were important in that they recognized the Athenian empire and the right of Athens to coerce their allies. The treasury at Delos was moved to Athens and subscriptions paid there became tribute to Athens. This greatly enriched the City of Athens.
daa Sparta brought the soldiers ndd the Athens brought theirr navy (:
they never joined forces
Pericles' decision to attack Sparta