Since the question states that you need only one explained, the religion is the simplest because everything then was about Buddhism. It reached all levels of society and was widely practiced by many people, even described or seen thoroughly in works of literature or art.
-Strong military forces
- Increase in trade
-Alliances among small villages (alliances with the Romans)
Answer: Servant Leadership
Explanation: The service leader shares power, puts the needs of others first, and helps people develop and perform their jobs as well as possible. Service leadership reverses the pyramid of power; Instead of people working to serve the leader, the leader exists to serve others. When leaders shift to this paradigm of serving first, leaders achieve a purpose and creativity in those around them, resulting in better performing, more motivated and more satisfied people.