The United Nations: Founding, Charter, and the Veto

How was the UN founded, and who were its first members?

Fifty delegations met at the San Francisco Conference in 1945 and signed the UN Charter. There were 51 original members once Poland’s signature was added, including India, two years before its own independence.

The United Nations was founded in 1945, right after the Second World War, to prevent another global conflict.

Fifty delegations met at the San Francisco Conference, from April to June 1945. They signed the UN Charter on 26 June 1945. The UN formally came into existence on 24 October 1945.

The Charter had 51 original signatories in the end, not 50. Poland could not send a delegation to San Francisco in time, but it signed the Charter soon after and is still counted as a founding member.

India was a founding member of the UN in 1945 — two full years before India’s own independence in 1947. India’s delegation signed the Charter while still under British colonial rule.

Membership has grown from 51 to 193 countries today. South Sudan, which joined in 2011 after its own independence, is the most recent member admitted.

Source: standard record of the UN’s 1945 founding and membership growth.

What did the UN learn from the League of Nations’ failure?

The League of Nations had no enforcement power, and the United States never joined it. It failed to stop the very war it was built to prevent.

The UN replaced the League of Nations, founded in 1920 after the First World War. The League had no enforcement power, and the United States never joined it.

It failed to stop the very war it was built to prevent. The UN’s design, especially the veto, was a direct response to that failure.

Source: standard record of the League of Nations’ institutional weaknesses.

How does the Security Council veto actually work?

The Security Council’s five permanent members each hold a veto. It was built in deliberately to keep the wartime great powers inside the system, rather than risk them walking out.

The UN Security Council has five permanent members, the P5: the United States, United Kingdom, France, Russia, and China. Each one holds a veto over Council resolutions.

Japan, despite being a major economic power, is not a permanent member. Germany, India, and Brazil are also not permanent members. All have long pushed for reform.

The veto was built in specifically to keep the five wartime great powers inside the UN system. The League’s key weakness had been losing major powers to walkouts.

Under Charter Article 27, a Council resolution on a substantive matter needs 9 of 15 votes, including every P5 member voting yes or abstaining. A single P5 “no” vote blocks the resolution outright. An abstention, unlike a “no,” does not count as a veto.

Source: UN Charter, Article 27; standard record of Security Council composition.

How did the UN work around a frozen Council in 1950?

When Cold War deadlock froze the Council during the Korean War, the General Assembly passed “Uniting for Peace” in 1950. It let the Assembly recommend action when the Council was blocked.

When Cold War deadlock froze the Council during the Korean War, the General Assembly passed the “Uniting for Peace” resolution in 1950. It let the Assembly recommend action when the Council was blocked by a veto.

Security Council reform, including expanding permanent seats, remains an unresolved debate at the UN today.

Source: UN General Assembly Resolution 377 A(V), “Uniting for Peace,” 1950.

What did the UN actually carry over from the League?

The UN runs on six principal organs. Some League-era institutions, like the International Labour Organization and the World Court, survived directly into the UN system.

The UN runs on six principal organs. They are the General Assembly, Security Council, Economic and Social Council (ECOSOC), Trusteeship Council, International Court of Justice (ICJ), and the Secretariat.

The ICJ, seated at The Hague, is not an entirely new invention. It succeeded the League’s own Permanent Court of International Justice, carrying over much of its structure and case law.

Not everything from the League era vanished. The International Labour Organization, founded in 1919 alongside the League, became the UN’s first specialized agency in 1946 and still operates today.

The Trusteeship Council oversaw former colonial territories being prepared for independence. It suspended regular operations in 1994, once Palau, its last trust territory, became independent.

Not all P5 members have used their veto equally. Russia, counting its Soviet-era record, has cast far more Security Council vetoes across UN history than any of the other four permanent members.

UN headquarters occupies land in New York donated by the Rockefeller family in 1946. Beyond New York, major UN duty stations also operate in Geneva, Vienna, and Nairobi.

Source: standard record of the UN’s principal organs and the League-to-UN institutional carryover.

Why is Security Council reform still live in 2026?

In May 2026, the UN Secretary-General called Council reform “absolutely essential,” noting no African or Latin American country holds a permanent seat. The US also twice vetoed Gaza ceasefire resolutions in 2025.

On 20 May 2026, UN Secretary-General António Guterres called Security Council reform “absolutely essential” and “the most important reform that needs to be established.” He said no African or Latin American country holds a permanent seat. Only one Asian country does, despite Asia holding half the world’s population.

On 4 June and 18 September 2025, the United States twice vetoed Gaza ceasefire resolutions. Each time it was the sole “no” vote against 14 other Council members in favour.

Both events show the same underlying tension this lesson traces back to 1945. A Council designed around 1945’s great powers is still working, and still contested, eight decades later.

Source: UN News, 20 May 2026; UN Meetings Coverage, 4 June and 18 September 2025.

Exam Angle: The Usual Traps Here

Trap 1: CDS-II 2023 tested this: Japan is not a permanent member of the UN Security Council. France, China, and the United Kingdom all are. See the original question.

Trap 2: NDA & NA 2020 tested that the UN Charter was signed at the San Francisco Conference in 1945, not at The Hague, London, or Berlin. See the original question.

Trap 3: don’t mix up the League’s specific weaknesses (no enforcement power, and the US never joining) with the UN’s own, later design. A question may test either institution’s flaws separately.

Source: CDS-II 2023; NDA & NA (I) & (II) 2020.

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Primary sources

• UN Charter, 1945, Article 27.
• UN General Assembly Resolution 377 A(V), “Uniting for Peace,” 1950.
• CDS-II 2023 General Knowledge.
• NDA & NA (I) & (II) 2020 General Ability Test.

Related reading

• All World History Articles
• IntlRel0026 — United Nations: Founding, Charter and Purposes — the full founding story and Charter text this article summarises.
• IntlRel0027 — UN General Assembly and Security Council — a full deep-dive on how the veto and Council reform debate work today.
• IntlRel0032 — India and the United Nations — India’s own role as a founding member, expanded.

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