United Nations Security Council
The UN officially came into existence on 24 October 1945 upon ratification of the Charter by the five then-permanent members of the Security Council and by a majority of the other 46 signatories. On 17 January 1946, the Security Council met for the first time at Church House, Westminster, in London, United Kingdom.
United Nations Security Council Resolution 1645
United Nations Security Council Resolution 1645, adopted unanimously on 20 December 2005, acting concurrently with the United Nations General Assembly, the Council established the United Nations Peacebuilding Commission to advise on post-conflict situations, in accordance with the declaration of the 2005 World Summit.