5. Athens was resented mainly because it was the "Golden Age of Athens'". Other Greek city-states, like Spart purely resented Athens because of their wealth and fame.
6. Athens and Sparta were very different in many cases. In Sparta, the main focus was being strong physically rather than academically. Boys started training at the age of seven and rarely got a chance to go to school and learn. But, in Athens, boys were allowed to go to school and learn to read and do other things. Evidence is that Athens produced some of the most famous writers or philosophers, like Socrates, Plato, Aesop, Homer, Aristotle and Pericles. They were very different, hence the reason they didn't get along.
7. Athens and Sparta were invincible when combing their forces, in total they had over 7,000 soldiers, which was a lot back then. Both city-states showed they wouldn't go down without a fight.
