The United Nations (UN) is an intergovernmental organization to promote international co-operation. A replacement for the ineffective League of Nations, the organization was established on 24 October 1945 after World War II in order to prevent another such conflict. At its founding, the UN had 51 member states; there are now 193. The headquarters of the United Nations is in Manhattan, New York City, and experiences extraterritoriality. Further main offices are situated in Geneva, Nairobi and Vienna. The organization is financed by assessed and voluntary contributions from its member states. Its objectives include maintaining international peace and security, promoting human rights, fostering social and economic development, protecting the environment, and providing humanitarian aid in cases of famine, natural disaster, and armed conflict.
I disagree with UN being able to start World War III, because it happens. The only way world wars begin is when countries ally with fighting countries, and the enemy does the same. So, UN can't just have a meeting, and then the German representative stands up, and shouts "Oh, let's have a world war with IRAQ!" and then the council murmurs in agreement. That is SIMPLY impossible to do, you have to declare war, then other countries declare war.