Slavery made all crops MORE profitable. If you're talking about America, slaves were brought to the Caribbean to cut sugar cane in droves. This is probably the biggest crop using most slaves initially. Cotton became a big slave labor driven industry in the 19th century for several reasons. However, slaves were initially and primarily owned and used as domestic helpers in the Americas. Only once certain industrial processes were invented and began to be applied to agricultural products such as cotton, which allowed its large scale PROCESSING, did the demand for the RAW cotton skyrocket and thus the demand for slaves to pick it increase as well.
If I may say so, the question is backwards. Certain crops did not make slavery profitable, there had always been a market for slaves. It was Slavery which made certain crops profitable.
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It was very profitable. It allowed the southern colonies to hold profitable tobacco planting. Off this staple crop, they made a lot of money.
The practice of slavery made the growing of cash crops profitable in the South. It was decades after slavery that mechanization made it extremely profitable again.
cotton gin
Slavery was so profitable, it sprouted more millionaires per capita in the Mississippi River valley than anywhere in the nation. With cash crops of tobacco, cotton and sugar cane, America's southern states became the economic engine of the burgeoning nation.
Well to start off, well made hand-picked cotton from slaves was very rare and costly due to the amount of time needed to pluck the seeds out.