Here's my take:
The North wanted their cut of the Souths $, and when they refused they got their shit fucked up.
The South wanted to keep their profits for themselves and be left alone as winners do.
But the profits the north wanted to take from the south was was only possible due to free labor\slavery.
So YES it was ultimately about resources.
But for the south to act like slavery had nothing to do with it is disingenuous as it was the economic engine for their prosperity.
2\2
@basedbagel - Personally, I've concluded that it was fought to answer the question of self-determination. That answer was "no".