What government and communication systems did the Persians create?

The Persians established a highly organized government system under the Achaemenid Empire, characterized by a centralized administration divided into provinces called satrapies, each governed by a satrap. They implemented a codified legal system and promoted infrastructure projects, such as the Royal Road, which facilitated trade and communication. For communication, they developed an efficient courier system known as the Angarium, utilizing mounted messengers to relay information across vast distances swiftly. This combination of administrative efficiency and communication advancements contributed to the empire's stability and cohesion.