If the Achaemenid Empire had not fallen, they would have continued to be a major force in the Middle East. The empire would have gone on to establish an administrative system that eventually led to the spread of Persian culture, language, and religion around the world. It would likely have continued to grow its sphere of influence, and because of their diplomatic approach, the empire could have easily negotiated and formed alliances with other nations. With its vast resources, it could have become an even bigger power than it was in its prime. This could have ensured peace and stability for the region for centuries.