Government by the consent of the governed does not necessarily encompass a right to opt out. It only requires that within the existing political unit a right to participate through electoral processes be available. Moreover participatory rights do not entail a right to secede...."
Lea Brilmayer (1991) Secession and self-determination: a territorial interpretation. Yale Journal of International Law 16, 177-202, p.184-185.
Quoted from "The Ethics of Secession."