Organization of American States
| DATE | NATION | 
| 30 april 1948 | Argentina | 
|  | Bolivia | 
|  | Brazil | 
|  | Chile | 
|  | Colombia | 
|  | Costa Rica | 
|  | Cuba (until 1962) | 
|  | Dominican Republic | 
|  | Ecuador | 
|  | El Salvador | 
|  | Guatemala | 
|  | Haiti | 
|  | Honduras | 
|  | Mexico | 
|  | Nicaragua | 
|  | Panama | 
|  | Paraguay | 
|  | Peru | 
|  | USA | 
|  | Uruguay | 
|  | Venezuela | 
| 28 february 1967 | Trinidad and Tobago | 
|  | Barbados | 
| 25 june 1969 | Jamaica | 
| 8 may 1975 | Grenada | 
| 8 june 1977 | Suriname | 
| 22 may 1979 | Dominica | 
|  | S. Lucia | 
| 5 december 1981 | Antigua and Barbuda | 
|  | S. Vincent and Grenadine | 
| march 1982 | Bahamas | 
| 12 march 1984 | S.Kittis and Nevis | 
| 8 january 1990 | Canada | 
| 8 january 1991 | Guyana | 
|  | Belize | 
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