OAS
According to the organization's official website found at: http://www.oas.org/pt/sobre/quem_somos.asp
"The Organization of American States is the oldest regional body in the world. Its origins date back to the First International Conference of American States, held in Washington, DC, from October 1889 to April 1890. This meeting resulted in the creation of the International Union of Republics American States, and a network of provisions and institutions began to be weaved, giving rise to what will become known as the “Inter-American System”, the oldest international institutional system.
The OAS was founded in 1948 with the signing, in Bogotá, Colombia, of the OAS letter which entered into force in December 1951. Subsequently, the Charter was amended by the Protocol of Buenos Aires , signed in 1967 and which entered into force in February 1970; fur Protocol of Cartagena de Indias , signed in 1985 and which entered into force in 1988; fur Protocol of Managua , signed in 1993 and which entered into force in January 1996; and fur Washington Protocol , signed in 1992 and which entered into force in September 1997.
The Organization was created to achieve in the member states, as stipulated in Article 1 of the Charter, “an order of peace and justice, to promote their solidarity, intensify their collaboration and defend their sovereignty, territorial integrity and independence”.
Today, the OAS brings together the 35 independent states of the Americas and constitutes the main political, legal, and social governmental forum in the Hemisphere. In addition, the Organization granted the status of permanent observer to 69 states and European Union (I).
To achieve its most important objectives, the OAS is based on its main pillars which are democracy, human rights, security and development."
Like the UN, the OAS also has an official charter that, as a treaty, sets out its powers and functions, as well as the obligations of the participating countries.
check below Letter from the Organization of American States:
