Answer:
Pericles created a plan that made most of the famous structures, like the Acropolis and the Parthenon. He also helped Athenian democracy to great extents.
Sparta decided to start the war because the spartans had a plan to win, and had many help from other empires, such as the Achaemenid Empire.
The Spartan strategy was to invade the land surrounding Athens, which deprived Athen's food and source.
Sparta won.
I hope this helped!
