What was a major accomplishment of King darius

Darius organized the empire by dividing it into provinces and placing satraps to govern it. He organized a new uniform monetary system, along with making Aramaic the official language of the empire. He also put the empire in better standing by building roads and introducing standard weights and measures.

He created mented coins and the silk road. He also led military campaigns in Europe, Greece, and even in the Indus valley, conquering lands and expanding his empire.