The right to self-determination is a universal and intrinsic human right. Governments govern by the consent of the governed. If the people wish to change the state under which they consent to live then it is their decision, and their decision alone, to change it according to their own needs and desires.
Legal institutions, chapters and constitutions the World over recognise and guarantee this right.
Further legal documentation recognising the right to self-determination (secession/independence/autonomy) can be found amongst a great number of sources, however for this purpose there is more than sufficient excess detailing the legal framework which supports and guarantees the inalienable human right to self-determination.
(If direction toward further legal documentation supporting self-determination is necessary, contact the Head Office.)