Civil war history without slave bullshit.?

I"m wanting to get a southern pride tattoo. a confederate flag with scrolls saying "Southern Pride" on them. My girlfriend doesn't want me to because she thinks it raceist. I told her that race has nothing to do with it and the civil war wasn't about even about slavary and yata yata like they teach that bullshit in public school. I've told her the north had just as many slaves as the south did and even had the main slave port in Maryiland. I told her the reason the civil war started was because the north was industrial and the south was agricultural and the federal governement would allow the south to send their exports (cotton) to England where it would had been cheaper for them otherthan the north. What is a good website that backs up the real reason of the civil war and doesn't talk all about slavary **** like they teach in public schools because it is very misleading. Both sides were guilty of slaves and hell most plantations I've read about even paid their slaves.