Union of South American Nations

Intergovernmental regional organization

The Union of South American Nations (USAN), sometimes also referred to as the South American Union, abbreviated in Spanish as UNASUR and in Portuguese as UNASUL, is an intergovernmental regional organization. It was set up by Hugo Chávez to counteract the influence of the United States in the region. The UNASUR Constitutive Treaty was signed on 23 May 2008, at the Third Summit of Heads of State, held in Brasília, Brazil.

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