Birds flock together!! (:
Answer:
The boundaries set by Europeans.
Explanation:
During the European colonization of Africa the boundaries made by the Europeans would often lump rival tribes together, and put them under European rule. then when decolonization happened the rival and hostile tribes started to have disputes over territory
The first one is Christianity
Most of Maghreb (North Africa) resembles Arabian peninsula the most. That is the Physical geography part. Egypt from the earliest times was demographically, ethnically, culturally & socially contiguous with the Levant (Asia's West Coast on the Mediterranean Sea) from where the influence spread west till the Atlantic Ocean. Then (in those times) they weren't aware that theirs was a different continent (as most American school children think now, "if they are from different continents they should be different").<span> </span>