The United Nations and Collective Security (SACE Stage 2 Modern History)

What this dot point is asking

You must explain why the UN was created, how it works, what it has done, and how effective it has been. Strong answers weigh its successes against its failures and assess the structural limits on its power.

Establishment and structure

The UN grew out of the failure of the League of Nations and the determination, expressed in wartime conferences, to build a stronger body to keep the peace. The Charter was signed in San Francisco in 1945 by 51 founding members. Its main organs are the General Assembly (where every member has one vote), the Security Council (responsible for peace and security), the Secretariat led by the Secretary-General, the International Court of Justice, and the Economic and Social Council. The five permanent members of the Security Council, the United States, the Soviet Union (now Russia), Britain, France and China, hold a veto, a compromise that secured great-power participation but also allowed any of them to block action.

The Cold War, peacekeeping and decolonisation

During the Cold War the rivalry between the superpowers frequently froze the Security Council. A rare exception came in 1950, when the Soviet boycott allowed the UN to authorise the defence of South Korea. Unable to enforce collective security in the way its founders hoped, the UN developed peacekeeping, the deployment of neutral forces (the "blue helmets") to monitor ceasefires, beginning with the Suez Crisis (1956). Decolonisation transformed the organisation: membership swelled as new African and Asian states joined, shifting the General Assembly's focus towards anti-colonialism, development and the concerns of the global South.

Human rights, development and the wider system

Beyond security, the UN built a global community through its agencies and declarations. The Universal Declaration of Human Rights (1948) set a moral standard later developed into binding covenants. Bodies such as the World Health Organization, UNICEF, UNESCO and the UN High Commissioner for Refugees addressed health, children, education and displaced people. Conferences and goals, culminating in the Millennium Development Goals (2000), coordinated international action on poverty and disease. This humanitarian and developmental work is often the UN's most enduring achievement, even when its security role stalls.

Effectiveness and historiography

The post-Cold-War period raised hopes that the UN could finally fulfil its security role, as in the authorised coalition that reversed Iraq's invasion of Kuwait (1991). But the 1990s also exposed its limits: peacekeepers failed to prevent genocide in Rwanda (1994) and the massacre at Srebrenica (1995), and the US-led invasion of Iraq (2003) proceeded without UN authorisation, challenging its authority. Reform of the Security Council, especially the veto and permanent membership, has been debated for decades without success.

Historians and analysts debate the UN's record. Critics stress its paralysis, bureaucracy and dependence on great-power will; defenders point to decades without world war, successful peacekeeping, decolonisation, and immense humanitarian work. SACE answers should weigh these strengths and weaknesses and connect them to the organisation's structure.