What reforms did Great Darius carry out?

Darius carried out administrative, tax and monetary reforms. Administrative reform consisted of dividing the country into satrapies, districts. The Persians were at the head of the districts, not local officials. Although at some point they also raised uprisings and fought for power. As for the tax reform, Darius distributed land to those who paid cash and in-kind taxes, as well as to the soldiers. Then came the monetary reform. Darius I began to mint a single gold darik coin weighing 8.4 g, a single for the empire. Coins were in circulation for several centuries.