There was no Greek Empire. The Greek world was comprised of over 2,000 independent city-states. Alexander, king of Macedonia which was not a Greek state, conquered the Persian Empire in a 10 year campaign; he died after that. His generals divided the conquered territories into kingdoms of their own.
Becauese of his great military achievement of defeating and taking over the Persian Empire.
By defeating the Persian king Darius in a series of battles, and also defeating any local opposition of 10 years.
Alexander the Great defeated the Persian empire
Alexander conquered the Persian Empire.
It was either starting off the Hellenistic culture defeating the Persians or becoming a pharoah of Egypt.
The surplus male population of the Greek world anxious for employment, which provided Alexander withe the superior armoured infantry capable of defeating the more numerourous but unarmoured Persian infantry.
The surplus male population of the Greek world anxious for employment, which provided Alexander withe the superior armoured infantry capable of defeating the more numerourous but unarmoured Persian infantry.
The surplus male population of the Greek world anxious for employment, which provided Alexander withe the superior armoured infantry capable of defeating the more numerourous but unarmoured Persian infantry.
The Macedonian Greek Empire of Alexander the Great conquered the Persian Empire and incorporated all of its lands.
Alexander the Great's conquest of the Persian Empire created an empire reaching from Egypt to India.
because he felt like it
He defeated the Persian army, but the remaining eastern provinces still held out. It took him several years and a lot of fighting to bring them under control.