Answer:
The empire was connected by many roads and a postal system. The most famous road was the Royal Road built by King Darius the Great.
Step-by-step explanation:
What happened between Greece and Persia?
The collision between the fractious political world of the Greeks and the enormous empire of the Persians began when Cyrus the Great conquered the Greek-inhabited region of Ionia in 547 BC. Struggling to control the independent-minded cities of Ionia, the Persians appointed tyrants to rule each of them.