Who discovered it? It was given in the Garden, just like everything else the Lord made—God made corn; God made corn for us; He gave it to us and showed it to Adam, so Adam “discovered” it when the Lord gave it to him.
The world was very different before the Flood, before Babel. All that was made was given to man in the Garden, according to Genesis. Knowledge was great back then (Cain “went out and built a city”).
We have different knowledge now, and there is a great deal of “lost knowledge,” but you know the Bible says that in the Last Days knowledge will increase. The 20th Century saw an increase in knowledge unseen in the history of the world.
We tend to limit our perception, our perspective, to what the “historians” tell us, but God’s Word tells us the truth.
I believe man's history says it originated, in the natural, in Mexico.