Since its beginning, mankind has alternated between periods of peace and war. The Twentieth Century was the first one in which attempts were made to outlaw war and to establish institutions which would protect the peoples of the world against war. After the carnage of the Second World War, the United Nations was established "to save succeeding generations from the scourge of war," and the Security Council was given the "primary responsibility for the maintenance of international peace and security." The founders of the United Nations tried to ensure that the Council would have necessary means for discharging this responsibility, and Member States agreed to make available to the Council for this purpose armed forces sufficient for maintaining peace.
Louis B. Sohn,
The New Dimensions of United Nations Peacemaking
Available at: http://digitalcommons.law.uga.edu/fac_artchop/189