Why was the rise of persia such an important development in the early part of the classical period ?

The rise of Persia was an important development in the early part of the classical period because the classical period was a time of war and they got diverse people of the Middle East, Egypt, Asia Minor, Central Asia and the Indus Valley into one state. This led to better trade networks that invariably fuel a larger economy. The Persians also had an enormous impact on the Greeks. While mainland Greece was never truly incorporated into the Persian Empire but the Persian cities of Asia Minor were.

where is the subject? hahahaha