Is there more to the question?
B, that the south would return to its prewar system without slavery.
One problem is the flea beetle: for example in 1876 flea beetles have destroyed half of the crops; many trials and experiments were needed to combat this problem.
Additionally, you needed to make sure that you have enough workers cultivating it.
Finally, your income was dependent on the prize you could sell it for, if the prize dropped, as in 1750s, it could happen that you would not even make ehough money to pay the loans.
The north of the US did not want slavery while the south did want slavery. they had a war over it (the civil war) the north won and slavery was abolished.
You are referring to air pollution, also called "smog"<em> </em>(a combination of the words "smoke" and "fog"), a chemical combination of smoke and fog, which is extremely unpleasant and, most importantly, very harmful. In addition to vehicle exhaust and factory smoke, air pollution is also caused by smoke from heaters.
