O.A.S

The Organization of American States (OAS) is the world’s oldest regional organization, dating back to the First International Conference of American States, it came into being in 1948 with the signing, in Bogotá, Colombia, of the Charter of the OAS.

Nowadays it has 35 independent states of the Americas and has granted permanent observer status to 63 states, as well as to the European Union. The Organization of American States constitutes the principal political, juridical, and social governmental forum in the Hemisphere.

This O.A.S is the most important organization for the american states and it was established to achieve among its member states an order of peace and justice, to promote their solidarity, to strengthen their collaboration, and to defend their sovereignty, their territorial integrity, and their independence.(Article 1 of the Charter of the OAS)

The OAS uses a four-pronged approach to effectively implement its essential purposes, based on its pillars: democracy, human rights, security, and development.

References
Our purpose(n.d)O.A.S, Retrieved on May 17th, from:
http://www.oas.org/en/about/our_structure.asp