But when the words of the confederate leaders make it clear that slavery was the most important reason for rebellion by an overwhelming margin IMO, it wasn't the fact of slavery, per se. It was the fact that, with slavery, the south could produce with much less overhead and undercut the north.
Have you EVER seen a history where the lessons were not slanted by the winners side.
It may have been about slavery, in the main, for the south, I believe that the north had many more reasons than JUST slavery.
Have you ever read the confederate documents of the period? Ever read any of the Declarations of the Causes of Secession published by four of the states? Ever read any of the speeches of Alexander Stephens, vice-president of the confederate states? Or Barnwell Rhett or Edmund Ruffin or William Yancey? Those men, in their own words, make it clear what the reason for rebellion was. Defense of slavery. You can rewrite history but you can't remove words from the mouths of men once they are spoken.