Answer:
Protected people and made merchants feel safe .
Step-by-step explanation:
Benin City is a medieval city, known as Edo, located in southern Nigeria. The Benin empire is one of the old and developed states in west Africa. The Walls of Benin City made people safe and protected from the invaders and also brought the builders, artisans, and merchants to flourish the Empire The Hausa cities like Kano, became powerful, by the trans- Saharan trade in Cloth, salt, grain, which contribute to their economic and cultural development.