Union of South American Nations (UNASUR)
History. Established in May 2008 in Brazil, it is anticipated that the Union of South American Nations will eventually supersede Mercosur and the Andean Community, creating an enlarged customs union with a single market, parliament, secretariat and central bank, based on the European Union structure. UNASUR is the successor body to the now defunct South American Community of Nations (CSN/SACN), founded in 2004. However, insufficiently defined goals and ongoing disputes between members of the already-existing blocs may hamper development, as may the growing US military presence in Colombia and future bilateral trade negotiations with the USA.