Beyond ridiculous. It could NEVER be peaceful and your demarcations are laughable. The divisions within families, communities, etc. put the lie to your suggestion.
Just because we've settled our differences peacefully for the last 101 years does not mean that we will continue to do so.
Past performance is no guarantee of future results.
S/B 151 years
Need more coffee
Well, did the USSR dissolve? Did Czechoslavakia and Yugoslavia? Some peaceful, some not. History is filled with separations, but you are right most were not peaceful, but it is possible.