Didn't Russia/USSR basically do just that to the transural part of Russia/USSR? I don't think anyone today would think of devolving that part of Russia (or for that Matter China devolve Machuria (as the Japanese were hoping to do in wwII))
Once things settle down like that it's been too long and practical assimilation into the victors has long happened.
There are a few exceptions when the people are too dissimilar and assimilation has not completed as in Turkey and the Kurds.
Once things settle down like that it's been too long and practical assimilation into the victors has long happened.
There are a few exceptions when the people are too dissimilar and assimilation has not completed as in Turkey and the Kurds.