Inter-American Treaty of Reciprocal Assistance
| Inter-American Treaty of Reciprocal Assistance Traité interaméricain d'assistance réciproque Tratado Interamericano de Assistência Recíproca Tratado Interamericano de Asistencia Recíproca | |
|---|---|
Member states in green with Venezuela in light green. | |
| Signed | 2 September 1947 |
| Location | Rio de Janeiro |
| Effective | 3 December 1948 |
| Condition | Ratification by two-thirds of the signatory states |
| Signatories | 23 |
| Parties | 18 |
| Depositary | Pan American Union |
| Languages | English, French, Portuguese, and Spanish |
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The Inter-American Treaty of Reciprocal Assistance (commonly known as the Rio Treaty, the Rio Pact, the Treaty of Reciprocal Assistance, or by the Spanish-language acronym TIAR from Tratado Interamericano de Asistencia Recíproca) is an intergovernmental collective security agreement signed in 1947 in Rio de Janeiro at a meeting of the American states.
The central principle contained in its articles is that an attack against one is to be considered an attack against them all; this was known as the "hemispheric defense" doctrine. Despite this, several members have breached the treaty on multiple occasions.
The treaty was initially created in 1947 and came into force in 1948, in accordance with Article 22 of the treaty. The Bahamas was the most recent country to sign and ratify it in 1982.