The southern states started the civil war in protest against moves to end slavery which they profited from directly. It was not northern states deciding to be aggressors against the southern states for no good reason. The circumstances were completely different and you know it (it's in the wikipedia article you cite!).

It’s a lot more complicated than that as the Wikipedia page mentions. The southern states had ‘succeeded’ months before fighting broke out. Lincoln made some concessions but wasn’t willing to relinquish federal land in southern states or accept them having actually left. Meanwhile congress passed many new laws once southern state senators had left.