The main building for the United Nations is in New York City in the United States of America, but the UN also has important offices in Geneva (Switzerland), Nairobi (Kenya) and Vienna (Austria). The UN tries to be peaceful, but sometimes when talks do not work the UN, unlike the League of Nations, will fight too. In the 1950s the UN helped South Korea in a war against North Korea, and in the 1990s the UN helped to force Iraqi soldiers out of Kuwait. At other times, the UN has formed 'peacekeeping' forces. UN peacekeepers travel to troubled places in the world and try - sometimes successfully, sometimes not - to keep the peace. Today there are UN peacekeepers working in Afghanistan, Cyprus, Haiti, Liberia and several other countries.