<Table> <Tr> <Th_colspan="2"> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> Greco - Persian Wars </Th> </Tr> <Tr> <Td_colspan="2"> <Ul> <Li> Ionian Revolt </Li> <Li> First Persian invasion </Li> <Li> Second Persian invasion </Li> <Li> Greek counterattack </Li> <Li> Wars of the Delian League </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th_colspan="2"> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> Greco - Persian Wars </Th> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <Tr> <Td_colspan="2"> <Ul> <Li> Ionian Revolt </Li> <Li> First Persian invasion </Li> <Li> Second Persian invasion </Li> <Li> Greek counterattack </Li> <Li> Wars of the Delian League </Li> </Ul> </Td> </Tr>

What was the significance of the persian wars