What was one reason that industry in the south was not as developed as in the north?

The North had lots of coal mines, the South did not have as many and developping industry was thus harder. At the time of the Civil War, about 80% of all the industry was in the North, some counties in the North had more industrial workers and industry than the entire South.

Coal was the main source of energy that made the industrial revolution possible both in Europe and in the USA, this is why industry merged in coal-producing areas.

From the very inception of the USA, the South had been dominated by slaveowning planters whereas the North had merchants at the top of its social hierarchy. It explained the inherent differences between those two regions.

One reason that industry in the South was not as developed as in the North was the dominance of agriculture, particularly plantation agriculture reliant on slave labor. The Southern economy was heavily dependent on cash crops such as cotton, tobacco, and rice, which required large tracts of land and a cheap labor force. As a result, there was less investment in industrialization compared to the North, where industries such as textiles, manufacturing, and shipping thrived. Additionally, the Southern states lacked the infrastructure and capital necessary for widespread industrial development, as much of their wealth was tied up in land and slaves.