Secession was a peaceful act by the South. You're not free if you can't secede from an oppressive govt. In fact, that's what the original Revolution was about—secession. It's as American as apple pie.
“Experience should teach us to be most on our guard to protect liberty when the Government’s purposes are beneficent. Men born to freedom are naturally alert to repel invasion of their liberty by evil-minded rulers. The greatest dangers to liberty lurk in insidious encroachment by men of zeal, well-meaning but without understanding.” — James Madison