B) The Arab Empire unified feuding tribes under the religion of Islam.
At the begining of the Arab Empire, many arab tribes were united by the Islam new religion led by Prophet Mohammed. The crusades to spread the Islam word, helped to conquer and to unify regions of North Africa and Middle East. The language and laws of the Quran were embraced as well as the pilgrimage to Mecca. The Arab language spread and became popular too.
They needed slaves for labor in the New World.
Answer:
Sociology, Anthropology, Philosophy and English/Literature
Explanation: Searched it up
The three theories are warfare between city-state, overpopulation, and drought.
