[cryptonector]

Quite. It was very noticeable, and it was one of the reasons that people in the South resented the North and so were keen on secession. It's that pride that keeps one from admitting to making mistakes. I think many in the South understood unconsciously that industrialization was the future, not slavery, but they couldn't bring themselves to admit it, and the local slave-holding interests were culturally powerful. It took a long time to break that culture.

[User23]

I find the Albion's Seed[1] hypothesis to be considerably more convincing for explaining the Southern resentment of the North. The England that colonized the New World was far from a united front. I'm not going to attempt to summarize because it's a complex issue that I won't be able to do justice to in a few sentences. Nevertheless I recommend anyone who is interested to read that book or find a summary from someone more confident of his ability than me. The short version though is that the English immigrants to the new world were neither culturally or even racially[2] homogenous.

[1] https://en.wikipedia.org/wiki/Albion's_Seed

[2] This is why the framers fabricated a notion of "White" identity, to create solidarity where none had really existed. To understand what they meant by race one must look at contemporary dictionaries. Needless to say the word meant something very different over 200 years ago than it does today.

[cryptonector]

I've not read it. Certainly the colonies were made of different sub-cultures, and that would and did have a major impact in self-identity in the colonies. But even in the South there were large differences from one State to the next, and that leaves slavery- and climate-caused industrialization disparities between North and South as the main drivers of that resentment of the North, and that chip on their shoulder almost certainly exacerbated the South's cultural attachment to slavery. By 1861 the people of the South definitely saw themselves as quite apart from the people of the North, and even quite apart from each other (organizing as a confederacy was not just to be starkly different from the federal North, but also because they had and wanted to maintain very strong national identities in each Southern State).