French irredentism

right|thumb|Flag of France with rooster of Wallonia used by partisans of France-Wallonia union. Rattachism (, , "reattach-ism") or Reunionism (Réunionisme, , "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. It can be considered a French-speaking equivalent of Grootneerlandisme (or, histo

political and geographical theory for French borders