This consists of the movement of ideas from one point of origin over a large span of time. This has to include the complete absorption of ideas into society, not just partially.
To learn more about this:
https://study.com/academy/lesson/diffusion-of-innovation-theory-history-examples.html
Hope I helped!
The Abbasids established the new position of vizier to delegate central authority, and delegated even greater authority to local emirs. The Abbasid dynasty ruled as caliphs from their capital in Baghdad, in modern Iraq, after taking over authority of the Muslim empire from the Umayyads in 750 CE.
I agree driving should be age 18
