international organizations maintaining the peace in the world

There are many of the international organizations established to maintain the peace in the world.
Almost all the countries of the world are the members of the United Nation.
The United Nation was establish to resolve the issues of all the member countries with dialogue.
Many of the issues have been resolved in the United Nations regarding the wars.
 I think this organization have to do their work more efficiently for the establishment of peace in the world and to abstain the world from the war.