The industrialization created a north that wasn’t dependent on agriculture (farms) for their main source of income, thus they wouldn’t need said slaves to farm and the slavery industry wasn’t seen as a necessity. While the south who had a warmer climate allowed for more farms so they had been slow to industrialization and free labor ( slavery) was very convenient
It was the "Nobility" that paid the most in taxes to the French government, but it should be noted that this was because they held a vast majority of the wealth in the country.
