The war started mainly because of four aspects Militarism Alliances Imperialism and Nationalism. This is because big armies become potential threats to other countries.
hope this helps
A new breed of managers and experts replaced traditional property owners as the leaders of the middle class.
The geography of the region helped to shape the government and culture of the Ancient Greeks. Geographical formations including mountains, seas, and islands formed natural barriers between the Greek city-states and forced the Greeks to settle along the coast.