The United Nations came into being in 1945, following the devastation of the Second World War, with one central mission: the maintenance of international peace and security. The UN does this by working to prevent conflict; helping parties in conflict make peace; and creating the conditions to allow peace to hold and flourish. These activities often overlap and should reinforce one another, to be effective. The UN Security Council has the primary responsibility for international peace and security. The General Assembly and the Secretary-General play major, important, and complementary roles, along with other UN offices and bodies. United Nations peacebuilding activities are aimed at assisting countries emerging from conflict, reducing the risk of relapsing into conflict and at laying the foundation for sustainable peace and development. The UN peacebuilding architecture comprises the Peacebuilding Commission, the Peacebuilding Fund and the Peacebuilding Support Office. The Peacebuilding Support Office assists and supports the Peacebuilding Commission with strategic advice and policy guidance, administers the Peacebuilding Fund and serves the Secretary-General in coordinating United Nations agencies in their peacebuilding efforts.