<Tr> <Th> Depositary </Th> <Td> Pan American Union </Td> </Tr> <Tr> <Th> Languages </Th> <Td> English, French, Portuguese and Spanish </Td> </Tr> <P> The Inter-American Treaty of Reciprocal Assistance (commonly known as the Rio Treaty, the Rio Pact, or by the Spanish - language acronym TIAR from Tratado Interamericano de Asistencia Recíproca) was an agreement signed in 1947 in Rio de Janeiro among many countries of the Americas . 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 . 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 . </P> <P> Current Members: </P>

Which country is not part of the rio pact