[nostrademons]

The map of where slavery is allowed corresponds pretty well with the areas that are rural, as you don't need slaves to work the fields where there aren't fields, and slaves are a poor labor source for the more differentiated and fluid industries in cities (there isn't enough liquidity for them to adapt to changing economic conditions, as the slaves are property of a single owner and their labor isn't traded on a free market).

[terminalshort]

This is not true at all. Slavery wasn't allowed in the rural north. And in the south, slavery was part of all sectors of the economy. Slave factories were even a thing. Furthermore, slave labor could be traded on the market just as well as any other labor. There was nothing stopping a slave owner from renting out his slaves a contract labor. If the civil war hadn't happened when it did, southern slavery would have been an industrial horror.

[schainks]

This is also not true, not to mention a terrible assumption about how slavery in the south actually operated. Please read more.