How did the discovery of iron change life in west Africa?

    In core, we learned how the discovery of iron changed Ghana which is in West Africa. Ghana was being threatened by nomadic herders and needed protection. That is when they discovered iron. Ghana used the iron to make better spears for battle. Since many spears were made of bone, this was a great advantage for the people of Ghana. Then Ghana started to conquer other villages and neighbors and that was the making of the Ghana Empire.
    What I learned was that iron had a big impact on the people of Ghana. Ghana conquered people to make the Ghana Empire. It reminds me of when I read about the Aztecs.