Answer:
Tobacco
Explanation:
Tobacco was a big crop but in order to farm it takes a lot of manpower. In turn slaves were used to farm and grown the tobacco.
D. Moral compass which is mostly governed by the prefrontal contex of the brain, now this is found in humans only as of the late. The Frontal Lobe of the four lobes of the cerebral cortex is responsible for the logical thinking and problem solving, as well as rationality and reasoning further involves morality. In the theory of the Triune Brain it illustrated and clustered the brain into three different types which is the: Reptilian complex (instinct), limbic system (emotion), neocortex (higher brain)
Basically, without this movement, people would not have come to America (before 15th century and 11 Century in the north where the Vikings came) and they would not have established the cultures and developed the languages which are still practiced and spoken today (such as the Maya culture/language and the Quechua culture/language).
I think it is corn. That's only one of them. The others might be like fine silk