Ummmm.... Virtually every secession in the history of mankind was peaceful... but immediately followed up with a military response from the leadership that was just rejected. We peacefully declared Independence. The King didn't take it politely. The South peacefully declared nationhood. The North refused to leave SOUTH Carolina (hundreds of miles from their country), and eventually had to be removed with cannon fire. India declared independence, and the Brits killed tens of thousands of unarmed women and children before they were shamed into stopping.
Umm you realy so sure? Just look at Brexit, the USSR break up and numerous colonies of Europe gaining independence as just a few examples. Some secessions do devolve into war but we learned from the last one that that isn’t a good idea. Let states split off. If there is to be some kind of political reconciliation let it happen naturally and not at the point of bayonet.