List three factors that caused africa to become a growing source of slaves for the slave trade

1) The other developing countries like the Americas, were growing and they traded items like guns to Africa for slaves, eventually, this became a competition

2) Another factor is that the Africans themselves have use slaves themselves in a fair way and it just sparked them to use them

3) Becuase of this demand, Africa was eventually built on the slaves

All this happened because of trading