High Quality Content by WIKIPEDIA articles! The Anti-war Treaty of Non-aggression and Conciliation (also known as Saavedra Lamas Treaty) was an inter-American treaty signed in Rio de Janeiro on October 10, 1933. It was the brain-child of Carlos Saavedra Lamas, who was Argentinian Minister of Foreign Affairs at the time the treaty was concluded. It was signed by representatives of Argentina, Brazil, Chile, Mexico, Paraguay and Uruguay. The US government acceded to the treaty on August 10, 1934. The treaty went into effect on November 13, 1935. It was registered in League of Nations Treaty Series on November 28, 1935.