Here are the accurate statements that describe the Persian Wars:
- The end of the wars brought a golden age to Athens.
- Persia attacked Greece after Athens supported a rebellion by Greek colonists.
- Athens decisively defeated the Persians at the Battle of Marathon.
The statement "The Greek city-states were unable to unite against Xerxes' armies." is not entirely accurate, as they did unite to some extent, particularly in the aftermath of the Battle of Salamis. The statement "The Persian armies defeated the Greeks at Salamis." is also incorrect, as the Greeks, particularly the Athenians, won the Battle of Salamis.
So the correct responses are:
- The end of the wars brought a golden age to Athens.
- Persia attacked Greece after Athens supported a rebellion by Greek colonists.
- Athens decisively defeated the Persians at the Battle of Marathon.