the cotton gin
it's the telephone
he invented to computer
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cotton gin
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.
overboard
Jamestown, Virginia was one of the most important colonial cities. The crop that made it most profitable was tobacco.
Electricity
The invention of the cotton-gin. This made cotton so profitable that Southern farmers began to calculate that they could break away and form a separate nation.
The slave trade was the most profitable thing about slavery. Actually owning slaves was not terribly profitable and most slave owners were deeply in debt. But the business of selling slaves, whether they were grabbed from Africa or purchased or bartered in the Caribbean, was highly profitable. A large number of people made their living in the slave trade, transporting, auctioning, guarding, financing, insuring, etc. Southerners were also aware that Great Britain had first banned the slave trade, then followed up by banning slavery entirely. They felt that any movement to limit slavery, slave trading, slave states, etc., threatened their whole way of life.
spaceship
The wheel.