This is a list of intergovernmental organizations with continental scope and having the most wide and possibly non-overlapping membership - ordered by foundation date: * Americas: Organization of American States (OAS, 1948) * Europe: Council of Europe (CoE, 1949) * Antarctica: Antarctic Treaty System (ATS, 1959) * Africa: African Union (AU/OAU, 1963) * Oceania: Pacific Islands Forum (PIF/SPF, 1971) * Asia: Asia Cooperation Dialogue (ACD, 2002)