How did plantation crops and the slavery system change between 1800 and 1860? why did these changes occur?

I would say that the changes occurred between 1800 and 1860 in plantation crops and slavery systems were because of  the Industrial Revolution.After the southern states which needed the slaves the most were free to decide about the fate of the horrible slave trade. At this point in time, the cotton production was very low and there were around 700,000 slaves in the whole country. So there could have been a chance that the trade could have died out. But then textiles and several machines like the cotton gin which helped grow even more cotton and crops and the southern economy boomed. The cotton quantities increased and by 1840, the South was producing and exporting over 2/3 of the world’s cotton, giving the region power. And naturally with the bigger plantations, they needed more slaves and  White planters started looking for new slaves in the upper South states, and between 1800 and 1860, the domestic slave trade was so popular that there became a craze called "Negro Mania" (which is really racist). Now this is a horrible chapter in America's history but it was crucial for the southern economy, and it was an important resource to raise money, straightening the economy of the South.

‘yo mama attracted those indians.’ -mircromexsus