Need help ASAP!

The basic theory says that as wages were much lower in the North, the North had more opportunities to kick in the industrial revolution. The rational is the following:
Imagine you are a farm worker (you don't own the farm, you are paid to do the work), you are paid say $150 a year, a guy comes and tells you: "If you come to work in my factory in Chicago, I'll pay you $151." So you go there. If you were a Southerner, the same guy to convince you to come to work in his factory would have to pay you $501 a year because there you were paid $500 a year as a farm worker overseeing slaves.
Thus, a guy who would went to start a factory would go where rural wages are the lowest (i.e. the North). If not one but one hundred guys make the same decision, instead of one factory they will produce a whole industrial town. Here you have a feed-back effect called economies of scale.
The principle is the following: imagine that to start a factory one has to build a road going from his factory to the port and the cost of the road is $1000. If two guys decide to build their factory side by side, they only gonna have to use one road (the same), hence they can share the cost of building the road ($500 each). That's why industries usually concentrate in districts.
It also means that when one region has started to industrialize first, it wins an advantage that the others won't be able to challenge (in the example, if an other guy wants to start a factory, he will go where the two are already and will only have to pay $333 and not $500 or $1000 if he had chosen to build it next to only one other factory or alone).

The North and the South where exactly in this position. Other factors are at play (avalibility of primary materials such as coal, large population at a short distance which was important in a time when transports were expensive, the port of NYC was the best window on the European market and of course cultural barriers) but over all the economic background of antebellum US was essentially based on this wage difference due to three factors:
- Immigration in the North
- Slavery in the South (slaves are cheap bust monitoring was expensive)
- Overseeing slave was a 12 months per year job while farm workers usually had 8 months free of labour which gave them the opportunity to go to the cities for part of the year to work in factories.

Best of luck