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Sorry, this is simply not true. The declarations of secession explicitly spell this out. You are welcome to read them yourself, here is one for example https://avalon.law.yale.edu/19th_century/csa_scarsec.asp

Mississippi’s is even more explicit https://avalon.law.yale.edu/19th_century/csa_missec.asp - “Our position is thoroughly identified with slavery — the greatest material interest of the world”

The civil war was fought because slave states wanted to force slavery on other parts of our country, outside their own borders.