What are The 3 major ethnic groups in the Islamic empire?

this could be it am not sure

Historically, the caliphates were polities based on Islam which developed into multi-ethnic trans-national empires. During the medieval period, three major caliphates succeeded each other: the Rashidun Caliphate (632–661), the Umayyad Caliphate (661–750), and the Abbasid Caliphate (750–1258).

Explanation:

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.

they had more african americans than any other state.

hope this , have a good day. c;