What is one way that darius united the persian empire? he expanded his empire through peaceful means rather than conquest. he forced conquered people to adopt persian customs and religion. he standardized coinage and other aspects of the persian economy. he personally oversaw every branch of the persian government.

One way that Darius united the Persian empire was that he standardized coinage and other aspects of the Persian economy. Option C is correct.

Darius I was the third Persian King of the Achaemenid Empire. His reign protracted 36 years, time in which the Persian Empire reached its peak.

Darius stretched the borders of the empire, which reached the Indus river and included the rich provinces of modern day Pakistan into the Persian Empire.

He created a fairer traiding system.

d. direct