The transatlantic slave trade flourished in between the 18th and mid-19th centuries. why did the slave trade flourish? what conditions did the slaves endure?

The main reason why the Transatlantic Slave Trade flourished in between the 18th and mid-19th centuries was because the sugar trade was flourishing, since sugarcane was in such high demand and the slaves were employed in the can fields. The slaves endured horrific conditions and many died en route to the plantations. 

Do you have more info about it ? i doubt this is the answer because i don't have all the information but if trouble was brewing in a clinic maybe it was an argument as to which clinic was better or smth of that nature