After seven decades of existence has the UN become obsolete? Is it ripe for retirement? As Jussi Hanhimäki proves in the second edition of this Very Short Introduction, the answer is no. In the second decade of the twenty-first century the UN remains an indispensable organization that continues to save lives and improve the world as its founders hoped. Since its original publication in 2008, this 2nd edition includes more recent examples of the UN Security Council in action and peacekeeping efforts while exploring its most recent successes and failures. After a brief history of the United Nations and its predecessor, the League of Nations, Hanhimäki examines the UN's successes and failures as a guardian of international peace and security, as a promoter of human rights, as a protector of international law, and as an engineer of socio-economic development. This updated edition highlights what continues to make the UN a complicated organization today, and the ongoing challenges between