<P> The archive of the League of Nations was transferred to the United Nations Office at Geneva and is now an entry in the UNESCO Memory of the World Register . </P> <P> In the past few decades, the legacy of the League of Nations started to be reviewed by historians as the League Archives at Geneva were better explored, and the United Nations faced similar troubles to those of the interwar period . The current consensus state that, even though the League failed to achieve its ultimate goal of world peace, it did manage to build new roads towards expanding the rule of law across the globe; strengthened the concept of collective security, giving a voice to smaller nations; helped to raise awareness to problems like epidemics, slavery, child labor, colonial tyranny, refugee crisis and general working conditions through its numerous commissions and committees; and paved the way for new forms of statehood, as the mandate system put the colonial powers under international observation . </P> <P> Professor David Kennedy portrays the League as a unique moment when international affairs were "institutionalised", as opposed to the pre--First World War methods of law and politics . The principal Allies in the Second World War (the UK, the USSR, France, the U.S., and the Republic of China) became permanent members of the United Nations Security Council in 1946 . (In 1971 the People's Republic of China replaced the Republic of China (then only in control of Taiwan) as permanent member of the UN Security Council, and in 1991 the Russian Federation replaced the USSR .) Decisions of the Security Council are binding on all members of the UN; however, unanimous decisions are not required, unlike in the League Council . Permanent members of the Security Council can wield a veto to protect their vital interests . </P>

When did germany and japan leave the league of nations