

while no explicit mention of secession, the very act of the revolution and statements such as “…Governments are instituted among Men, deriving their just powers from the consent of the governed,–That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government…” and "…When in the Course of human events, it becomes necessary for one people to dissolve the political bands which have connected them with another…"have been used to show the idea the founding fathers supported secession.
Only a handful of times has anyone in the U.S.A. seceded, though most of the times it was just to create a new states in the U.S.A. It was officially outlawed after the C.S.A. seceded and not much of any serious attempt has been made since.

yeah. It wasn’t clear in my comment but I wasn’t trying to say they where put down just for seceding (Though to Lincoln it was a way more important thing than slavery) but that they are the most notable case of states leaving the union and they got beat the shit out of, two separate things.