Rattachism
Rattachism (French: Rattachisme, IPA: [ʁataʃism] , "reattach-ism") or Reunionism (Réunionisme, IPA: [ʁeynjɔnism] , "reunion-ism") is a political ideology which calls for the French-speaking part of Belgium or Wallonia to secede from Belgium and become part of France. Brussels, which is majority French-speaking but enclaved in Flanders, may be included within this ideology; as may the six Flemish municipalities with language facilities for French-speakers around Brussels.