How did trade affect nubia and north africa

Trade affected Nubia and north Africa by:

Letting them interact with people from different regions, increase their knowledge, their culture, their perception of the world and create wealth.

Explanation:

The trade affected Nubia by increasing its mark in the zone. The interactions with the traders led them to know people, culture, religions, ideologies, and history from other regions of the world. It helped them to widen their knowledge, as well as to increase their wealth. Nevertheless, after becoming richer the Egyptians saw them as a very good target of their power and rivalry against them to keep their status of the key player in the zone.

these civilizations were located around fertile rivers, where they could produce an abundance of crops