Cornwall and very many other national communities are minorities within their respective state, or even within their own historic territories. I have been collecting a few resources together that may be of interest. Just click on the title to pull up their site.
Right-to-education.org (page on minorities)
Federal Union of European Nationalities
UN Office of the High Commissioner on Human Rights
UNHCR Page on Indigenous Minorities
UCLA Resources on North American Indigenous Peoples’ Rights
Please follow and like my site: andrewclimo.co.uk