What unite the islamic empire as it spread under the abbasid dynasty?

the jizra
social classes
arabic language
medical advancements

The Arabic language

Explanation:

The Abbasids revolt was centered over the lack of representation from the mawali (converted), the influence exerted by regions traditionally identified with the Byzantines, and the use of the Byzantine bureaucratic framework.

After deposing the Ummayad, one radical change was the use of Arabic as lingua franca was imposed over the empire. This was initiated by the Ummayads, but with the Abbasids was finally complete. Therefore, the identity of Islam was based on membership to the umma and the language. That is the reason why the Empire survived as an entity for another 200 years until the contradictions between classes and the atomization of power emptied the Caliphate from real political power.

where is the picture of the graph or table?

answer: both considered peasants valued members of society.

explanation: the ancient chinese and indian empires were large asian empires that had the same problems with other big empires, they had to work hard and sometimes fight in order to keep them united, they both relied heavily on their capacity to trade and to send strange and rare items to europe, and had the father as the head of the house hold in both societies, but they didn´t considered pleasants as valued members of their society, they were the bottom of the social pyramid in both of their societies.