What nations made up the Allied Powers? What nations made up the Central Powers?

What nations were neutral?

Which front (red lines) was the longest?

Which front (red lines) had the most battles?

In which bodies of water was there German U-boat activity?

The persian wars started when emperor darius i began an invasion of greece. what caused darius to decide to attack greece? a. greek pirates had raided persia's merchant ships and coastal towns. b. greek armies had attacked and taken over land that belonged to persia. c. greek city-states had supported rebellions in the persian empire. d. greek leaders had declared independence from the persian empire.