The mission and work of the United Nations are guided by the purposes and principles contained in its founding Charter.ĭue to the powers vested in its Charter and its unique international character, the United Nations can take action on the issues confronting humanity in the 21st century, such as peace and security, climate change, sustainable development, human rights, disarmament, terrorism, humanitarian and health emergencies, gender equality, governance, food production, and more. It is currently made up of 193 Member States. The United Nations is an international organization founded in 1945.