Hi the answer is god god is always the answer
The people in the south of the sahara did not develop the technique in melting iron. the technique was brought to them through the trans-saharan trade. it was a trade route frequented by merchants primarily from arabia and some parts of asia. trough the trading, the civilizations in the sahara over time adopted the technique for melting iron. this would be around 12th century
Very. thanks to it, America is independent today instead of being part of England. It formed the bill of rights and all the rights Americans have today. So yeah, it is pretty relevant.