Although it wasn't the reason the bantu had to migrate across africa, this technology them become more powerful than other tribes. plowbronzeironrice

The correct answer is that the Bantu were among the first to use iron, especially when it came to the construction of weaponry that gave them an edge over other tribes in Africa.

Explanation:

The Bantu tribes are a group of people from Africa, whose origins are unknown. They became one of the best organized and most powerful of the tribes that inhabited Africa and they extended from East to South Africa. Initially known as West Africans, this group of people began migrating slowly, in small groups, between 1000 and 1800 A.D, in search of more, and more fertile, lands for inhabitation and agriculture, for their increasing numbers. Later on they acquired the name Bantu, which means "The People". Around 400 A.D, the Bantu were able to expand faster, and be successful against more hostile tribes, due to the fact that they began developing iron weaponry, which gave them an edge. Afterwards, the Bantu began also utilizing iron to create farming tools and other technologies, which made them powerful and advanced.