What have been the significant successes and disappointments of the united nations since its founding in 1945? why has the un been more effective in addressing issues of health and human rights than in maintaining international peace and security?

Among the successes of the U.N. are the maintenance of peace.  Despite the eruption of conflict, it still manages to preserve the universal peace wherein it would not lead to a full scale global conflict.  It has provided many humanitarian missions around the world.  It has also apprehended war criminals and tried them for crimes against humanity. It has provided food for areas where people are starving due to lack of food.  It also has its share of failures such preventing the ethnic cleansing campaigns in Bosnia and Rwanda.  There was the oil for food scandal where food was provided and paid in cash but it went to the hands of private individuals.    It is more successful in humanitarian missions because it has the support of the countries concerned as well as the international community.  It has difficulty in military security because it cannot intervene through military might.because it would be pulled into the conflict.

i'm pretty sure it would be, the mediterranean sea.