南米諸国連合
The UNASUR Constitutive Treaty, officially the Constitutive Treaty of the Union of South American Nations, was signed on May 23, 2008 during the extraordinary summit of heads of state and government of the Union of South American Nations (UNASUR) held in Brasília, Brazil. It officially established the Union of South American Nations, an intergovernmental continental union of twelve South American nations.