The Persians depicts the aftermath of the Greek triumph over the mighty Persian Empire at the Battle of Salamis. How does Aeschylus use the play to bolster Greek nationalism?

Greek tragedies often involve a singular tragic hero whose fatal flaw, also known as hamartia, undoes them. Is there a tragic hero in The Persians? What is their fatal flaw?

Queen Atossa and the chorus summon the ghost of Darius in the second major episode of the play. Why do they do this? What is the significance of what Darius reveals to them?