The United Nations (UN) Reason the UN Main roles of the UN: Example of what the UN does: exists: 1 ) Year Founded: Current Number of Countries Involved: 2) The North Atlantic Treaty Reason NATO exists: Main roles of NATO: Example of what NATO does: Organization (NATO) 1) Year Founded: 2) Current Number of Countries Involved: The European Union (EU) Reason the EU Main roles of the EU: Example of what the EU does: exists: 1) Year Founded: 2) Current Number of Countries Involved: 3) The World Bank Reason the WHO Main roles of the Example of what the WHO does: exists: WHO: Year Founded: 1) 2) Current Number of Countries Involved