Even though you are just trolling, the popular idea is it was over slavery. However the main reason was state's rights versus federal rights. Basically the states were against the federal govt, each vying for more power over the other. The confederates wanted a country that was a group of sovereign states that were loosely held together by a federal govt, the fed mostly existing to regulate a single monetary system (can anyone say EU?). The union was for a country with a govt whose federal branch wielded more power than the states, far beyond just the financial fed the confederates wanted. A modern example of the legacy of which side won is, a federal law supersedes a state law. If the south had won, passing from one state to another would be much like what passing from one country to another in Europe is like today.
An ironic lesson from the civil war is, in the U.S. we are told we are free, yet we dont seem to be free enough to secede even with a majority vote. I am 100% against slavery (obviously) or racism of any type, but I have to say that if those states wanted to leave the union, they should have been able to.