By conquering peoples stretching from North Africa to Central Asia and integrating them into the empire and using their resources.
Persian Empire
The Persian Empire had no one to rebel against, it was the strongest power in the region until it was taken over by Alexander the Great.
The Persian Empire.
The Persian Empire was not a person.
It converted the Delian League cities it had led against the Persian Empire into an empire of its own, and ruthlessly used its financial and military resources for its own benefit and power.
Persian Empire
The Persian Empire absorbed the Babylonian Empire.
Alexander the Great defeated the Persian empire
The Persian Empire absorbed the Baabylonian Empire.
Alexander conquered the Persian Empire.
An empire is an empire, a war is a war.
The Persian Empire incorporated the Indus Valley.