Hollywood seems to always make it over race and to end slavery, but I've always heard thats not really the reason we had a civil war
You might get a good reply to your question here, but if not, you can find several past threads on this subject listed in the FAQ: https://www.reddit.com/r/AskHistorians/wiki/civilwar#wiki_causes
Historians are the ones who say it was mainly about race and ending slavery. Hollywood merely portrays that. Southern history revisionists have been stressing the other contributing factors, but the main cause always goes back to slavery.