Pan-Celticism, also known as Celticism or Celtic nationalism, is a political, social and cultural movement advocating solidarity and cooperation between Celtic nations and the modern Celts in Northwestern Europe. Some pan-Celtic organisations advocate the Celtic nations seceding from the United Kingdom and France and forming their own separate federal state together, while others simply advocate very close cooperation between independent sovereign Celtic nations, in the form of Breton, Cornish, Irish, Manx, Scottish, and Welsh nationalism.