What contributed to the creation of the great powers of Assyrian, Babylonian, Persian?

The so-called Great Silk Road, which connected India with the Mediterranean countries, passed through the territories of these powers. Thus, the Assyrian, Babylonian and Persian powers acted as an intermediary in trade between India and the Mediterranean. This brought significant profits to these states. Agriculture, cattle breeding and handicrafts were at a fairly high level of development. It should be noted that the armies of these powers were sufficiently combat-ready for their time, and it was with the help of their armies that Assyria, Babylon and Persia were able to take their rightful place in history.