What Countries Today Belong To The OAS?
What Countries Today Belong To The OAS? Antigua and Barbuda. Argentina. Barbados. Belize. Bolivia. Brazil. Canada. Chile. What countries are a part of the OAS? Membership. 21 original OAS members (1948): Argentina, Bolivia, Brazil, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Guatemala, Haiti, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, United States, Uruguay,