First month sixth (DingWei years), February 14, 1967, signed by the 21 countries in Latin America Latin American treaty banning nuclear weapons.

"Latin American Treaty for the Prohibition of Nuclear Weapons", also known as the Treaty of Tlatelolco. 14 Latin American countries such as Mexico, Chile on February 14, 1967 in Mexico City's Tlatelolco in effect indefinitely. Treaty to take the way of entry into force of the State party. September 20, 1967, first to Mexico to take effect. 1995, 33 Latin American countries have all signed, of which 28 countries have ratified and enters into force.