Evolution and Structure of the United Nations (Class 12 Political Science)
Updated 15 October 2026 · Fact-checked
The UN was founded on 24 October 1945 as the successor to the League of Nations, which had failed to stop the Second World War. It aims to prevent conflict and promote cooperation and development. Its organs include the General Assembly, where each member has one vote, and a Security Council of five permanent and ten non-permanent members.
Notice the UN replaced the League after WWII; every state has one vote in the Assembly, while the Council has 5 permanent and 10 non-permanent members.
Illustration drawn for QuestionBuddy.
Understand Evolution and Structure of the UN
Why this topic matters. Chapter 4 opens with two questions boards keep returning to: why the world needs international organisations, and how the UN came to be and is organised. Expect 1-mark items on dates, the founding members and the permanent five; 2-mark items naming organs or advantages; and 6-mark answers on the composition and functions of the Security Council or of three organs. NCERT sections: 'Why international organisations?', 'Evolution of the UN', the founding timeline box, and the box on the Secretaries-General.
1. Why international organisations?
| Idea | What NCERT explains |
|---|---|
| Not a super-state | An international organisation has no authority over its members; states create it, it answers to them, and it exists only because they agreed to it |
| War and peace | Countries in dispute can talk through contentious issues and find peaceful solutions; most differences are in fact settled without war |
| Shared problems | Some challenges need everyone, e.g. wiping out a disease through worldwide vaccination, or stopping global warming, which needs at least all major industrial powers |
| Making cooperation work | Seeing the need to cooperate is not the same as cooperating. An organisation supplies information and ideas, plus mechanisms, rules and a bureaucracy, so members trust that costs are shared properly, benefits are divided fairly and agreements are honoured |
Two insiders sum it up: Dag Hammarskjold, the second Secretary-General, said the UN exists to save humanity from hell rather than lead it to heaven; Shashi Tharoor, a former Under-Secretary-General, borrowed Churchill's line that jaw-jaw is better than war-war: a 'talking shop' is better than a battlefield.
2. From the League to the UN. The First World War led to the League of Nations. Despite early success it could not prevent the Second World War (1939-45), which killed and wounded more people than any earlier war. The UN was set up in 1945, immediately after the war, as the League's successor.
| Date | Step towards the UN |
|---|---|
| August 1941 | Atlantic Charter signed by US President Franklin D. Roosevelt and British PM Winston Churchill |
| January 1942 | 26 Allied nations fighting the Axis Powers meet in Washington, D.C. and sign the 'Declaration by United Nations' |
| December 1943 | Tehran Conference Declaration of the Three Powers (US, Britain, Soviet Union) |
| February 1945 | Yalta Conference of the 'Big Three' (Roosevelt, Churchill, Stalin) decides to hold a UN conference |
| April-May 1945 | Two-month United Nations Conference on International Organisation at San Francisco |
| 26 June 1945 | UN Charter signed by 50 nations; Poland signed on 15 October, making 51 original members |
| 24 October 1945 | UN founded: hence UN Day |
| 30 October 1945 | India joins the UN |
3. Aims. To prevent international conflict and facilitate cooperation among states: stop disputes from turning into war, limit hostilities if war breaks out, and, since conflicts often grow out of poverty and backwardness, bring countries together for social and economic development everywhere.
4. Structure.
| Body | Composition and role (from NCERT) |
|---|---|
| General Assembly | All members, one vote each; debates and discusses global issues, including war and peace. 193 members by 2011, almost every independent state |
| Security Council | 5 permanent members (US, Russia, UK, France, China, chosen as the most powerful states and the victors of 1945) and 10 non-permanent members. Non-permanent members serve two years, cannot be re-elected immediately, and are chosen to represent all continents. Enlarged from 11 to 15 in 1965. Main task: preserving international peace and security |
| Veto | Only permanent members have it: one permanent member's negative vote stalls a decision even if all others vote for it |
| Secretariat | Administration and coordination of UN affairs; headed by the Secretary-General, the UN's most visible public figure and representative head |
| Economic and Social Council | Looks into the economic and social welfare of member countries |
| International Court of Justice | Resolves disputes between member countries |
| Trusteeship Council | The 2005 summit agreed to wind it up |
| Agencies | Social and economic work through WHO, UNDP, UNHRC, UNHCR, UNICEF, UNESCO and others |
5. The Secretaries-General.
| Secretary-General | Country, years | One thing NCERT notes |
|---|---|---|
| Trygve Lie | Norway, 1946-1952 | Worked for a ceasefire between India and Pakistan on Kashmir |
| Dag Hammarskjold | Sweden, 1953-1961 | Suez dispute, decolonisation of Africa; Nobel Peace Prize awarded after his death, 1961 |
| U Thant | Burma (Myanmar), 1961-1971 | Cuban Missile Crisis; UN Peacekeeping Force in Cyprus |
| Kurt Waldheim | Austria, 1972-1981 | Namibia, Lebanon; relief in Bangladesh |
| Javier Perez de Cuellar | Peru, 1982-1991 | Mediated after the Falklands War; independence of Namibia |
| Boutros Boutros-Ghali | Egypt, 1992-1996 | *An Agenda for Peace*; US blocked a second term |
| Kofi Annan | Ghana, 1997-2006 | Peacebuilding Commission and Human Rights Council (2005); Nobel Peace Prize 2001 |
| Ban Ki-moon | South Korea, 2007-2016 | Second Asian in the post; climate change, MDGs and SDGs, UN Women |
| Antonio Guterres | Portugal, from 1 January 2017 | Ninth Secretary-General; earlier PM of Portugal and UN High Commissioner for Refugees |
6. Cartoon focus: Lebanon, 2006. The chapter opens with two cartoons mocking the UN's ineffectiveness when Israel attacked Lebanon in June 2006, saying it had to control the militant group Hezbollah. Many civilians died; the UN passed a resolution only in August, and Israeli troops left only in October. NCERT sets this criticism against the view that the UN is still the most important international organisation in the world.
Key quotations
Short lines worth knowing by heart: who says them, when, and why they matter.
not created to take humanity to heaven, but to save it from hell
Dag Hammarskjold, second UN Secretary-General (quoted in NCERT, Chapter 4): Answering the charge that the UN has not solved the world's problems.
The UN's purpose is preventing catastrophe, not creating a perfect world.
jaw-jaw is better than war-war
Shashi Tharoor, quoting Churchill (NCERT, Chapter 4): Replying to critics who call the UN a 'talking shop'.
Talking, however tedious, is better than fighting.
An international organisation is not a super-state
NCERT, Contemporary World Politics, Chapter 4: Explaining what international organisations are.
States create them and they answer to states; they cannot command members.
the great hope of humanity for peace and progress
NCERT, Chapter 4: On how many people around the world see the UN.
Balances the cartoons that mock its ineffectiveness.
Evolution and Structure of the UN: key facts
- Founding timeline
- Aug 1941 Atlantic Charter (Roosevelt, Churchill)
- Jan 1942 Declaration by United Nations, 26 Allies, Washington
- Dec 1943 Tehran
- Feb 1945 Yalta, Big Three
- Apr-May 1945 San Francisco conference
- 26 Jun 1945 Charter, 50 states (+ Poland = 51)
- 24 Oct 1945 UN founded, UN Day
- 30 Oct 1945 India joins
- Chronology items pick four of these.
- Why international organisations
- Not a super-state; created by and answerable to states
- Help settle disputes peacefully
- Tackle problems no state can solve alone: disease, global warming
- Give information, ideas, rules, mechanisms and a bureaucracy so costs, benefits and promises are trusted
- Four heads for 'advantages' or 'importance' answers.
- Security Council
- 5 permanent: US, Russia, UK, France, China
- 10 non-permanent, 2-year terms, no immediate re-election, all continents
- 11 to 15 members in 1965
- Veto: one permanent member's negative vote stalls a decision
- Permanency and veto are the two privileges of the P5.
- Organs and functions
General Assembly debates global issues, one vote each Security Council international peace and security ECOSOC economic and social welfare ICJ disputes between members Secretariat administration, headed by the Secretary-General Trusteeship Council to be wound up (2005) - UNESCO, WHO, UNICEF are agencies, not organs.
- Secretaries-General in order
Lie Norway Hammarskjold Sweden U Thant Burma Waldheim Austria Perez de Cuellar Peru Boutros-Ghali Egypt Annan Ghana Ban Ki-moon South Korea Guterres Portugal, ninth, from 2017 - Ban Ki-moon was the second Asian; U Thant the first.
How to answer Evolution and Structure of the UN questions
Questions here are factual but must be precise: dates and numbers in 1-mark items, two organs or advantages in 2-mark items, and composition plus functions in 6-mark answers. A cartoon of the UN logo or a timeline extract is a common source.
- 1Read whether the question asks for organs, agencies or both; never list UNESCO or WHO as an organ.
- 2For 'composition', give numbers: all members in the General Assembly; 5 + 10 in the Security Council with two-year terms.
- 3For 'functions', pair each organ with one clear job, as in the formula table.
- 4For 'importance' or 'advantages', use the four heads: peaceful settlement, shared problems, rules and trust, a forum for all.
- 5In chronology items, anchor on 1945: League before, World Bank 1944 before, IAEA 1957 and WTO 1995 after.
- 6For a 6-mark answer, end with a judgement: imperfect, but the world would be worse without it.
Evolution and Structure of the UN in real life
The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.
Why an organisation, not just goodwill
Suppose every family in a housing society agrees the street lights must be fixed, yet nothing happens for months: nobody knows who pays how much, and some fear others will not pay their share. Then a residents' welfare association is formed with rules, a treasurer and accounts.
What does this show about international organisations?
Try it first, then show the solutionSolution
- Everyone agreeing on the need mirrors states recognising the need to cooperate.
- Disputes over shares and cheating mirror NCERT's worries about costs, benefits and broken promises.
- Rules, a treasurer and accounts mirror the mechanisms, rules and bureaucracy an organisation provides.
Answer: Recognising a shared need is not enough; an organisation with rules builds the trust that makes cooperation actually happen.
Memory hook: Need is not deed: rules make deeds.
Not a super-state
Imagine the residents' association tries to order one family to demolish its balcony. The family refuses, and the association has no police to make it obey.
How does this resemble the UN's position?
Try it first, then show the solutionSolution
- The association exists because members agreed to form it.
- It can persuade, mediate and publicise, but cannot command.
- Likewise the UN is created by and answers to states; it has no authority above them.
Answer: Like the association, the UN can help members settle problems, but it is not a government above them.
Memory hook: Made by states, answers to states.
Tricks to remember Evolution and Structure of the UN
Short memory aids. Say each one aloud once, then use it on a question the same day.
A-D-T-Y-S-C
Atlantic (1941), Declaration (1942), Tehran (1943), Yalta (Feb 1945), San Francisco (Apr-May 1945), Charter (26 June 1945): 'All Diplomats Take Yoga Sessions Calmly'.
Use it when: Chronology of the UN's founding.
Five plus ten, two years, no again
5 permanent, 10 non-permanent, each elected member sits 2 years and cannot return at once.
Use it when: Security Council composition.
Three Western, two Eastern
P5 = the three Western victors (US, UK, France) + the two big Eastern states (Russia, China). Japan, Germany and India are not in it.
Use it when: Permanent member MCQs.
Evolution and Structure of the UN: solved examples
Ordered from board level to HOTS. Try each one before you open the solution.
Example 1: Original members · 1 mark · MCQBoard level
The UN came into being with how many original founding members?
(a) 26
(b) 50
(c) 51
(d) 193
Try it first, then show the solutionSolution
- 50 signed on 26 June 1945; Poland signed on 15 October, making 51 (1 mark).
Answer: (c) 51
Example 2: Two advantages of international organisations · 2 marks · Very short answerBoard level
In what two ways does a body like the UN help states deal with disputes and shared problems they cannot handle alone? (2 marks)
Try it first, then show the solutionSolution
- Peaceful settlement of disputes (1 mark).
- Cooperation on problems no state can solve alone, with rules to build trust (1 mark).
Answer: (i) They give states a place to discuss disputes and find peaceful solutions instead of going to war. (ii) They help states cooperate on problems that need everyone, such as eradicating a disease or tackling global warming, by providing information, rules and mechanisms so that costs and benefits are shared fairly and promises are kept.
Example 3: Assertion and reason: the P5 · 1 mark · Assertion-reasonHarder board level
Assertion (A): The US, Russia, the UK, France and China were made permanent members of the Security Council.
Reason (R): They were the most powerful states immediately after the Second World War and were its victors.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Try it first, then show the solutionSolution
- NCERT gives exactly this as the reason for their selection (1 mark).
Answer: (a) Both A and R are true and R is the correct explanation of A.
Example 4: From the League to the UN · 4 marks · Short answerHarder board level
Trace how the United Nations evolved, mentioning any four steps between 1941 and 1945. (4 marks)
Try it first, then show the solutionSolution
- Background: League of Nations failed to prevent the Second World War.
- Any four of: Atlantic Charter 1941; Declaration by United Nations 1942; Tehran 1943; Yalta Feb 1945; San Francisco Apr-May 1945; Charter 26 June 1945; founding 24 October 1945 (1 mark each).
Answer: The League of Nations, created after the First World War, could not prevent the Second World War, so a stronger successor was planned during the war itself. (i) In August 1941 Roosevelt and Churchill signed the Atlantic Charter. (ii) In January 1942, 26 Allied nations fighting the Axis Powers met in Washington, D.C. and signed the Declaration by United Nations. (iii) At Yalta in February 1945 the Big Three (Roosevelt, Churchill and Stalin) decided to hold a conference on the new world body, which met at San Francisco in April-May 1945. (iv) The UN Charter was signed on 26 June 1945 by 50 nations (Poland later made it 51), and the UN was founded on 24 October 1945, now celebrated as UN Day. India joined on 30 October 1945.
Example 5: Source-based: the Lebanon cartoons · 4 marks · Source-basedHarder board level
Read the note (based on the background NCERT gives for its opening cartoons) and answer.
In June 2006, one country bombed its neighbour, saying it needed to control a militant group. Many civilians were killed and homes destroyed. The world body passed a resolution only in August, and the attacking army left only in October. Cartoonists drew the world body and its chief as helpless onlookers.
(i) Name the two countries and the militant group. (1)
(ii) Which international organisation was criticised? (1)
(iii) Despite such criticism, why do many people still consider this organisation indispensable? (2)
Try it first, then show the solutionSolution
- (i) Israel, Lebanon; Hezbollah (1 mark).
- (ii) The United Nations (1 mark).
- (iii) Forum for peaceful settlement; cooperation on shared problems; seen as hope for peace and progress (2 marks).
Answer: (i) Israel attacked Lebanon, saying it had to control Hezbollah. (ii) The United Nations and its Secretary-General. (iii) Because it is the one place where almost every state can discuss disputes instead of fighting (better jaw-jaw than war-war), and because problems such as disease and global warming need all countries to cooperate under shared rules. Many people therefore see the UN as the great hope for peace and progress, even when it acts slowly in a crisis.
Example 6: Long answer: composition and functions of organs · 6 marks · Long answerHOTS / competency
Describe the composition and one function each of the General Assembly, the Security Council and the Secretariat. Add one reason why the UN remains relevant. (6 marks)
Try it first, then show the solutionSolution
- General Assembly: all members, one vote; debates global issues (1.5 marks).
- Security Council: 5 permanent with veto, 10 non-permanent for two years; peace and security (1.5 marks).
- Secretariat: headed by the Secretary-General; administration and coordination (1.5 marks).
- Relevance with a reason (1.5 marks).
Answer: General Assembly: every member state belongs to it (193 by 2011) and each has one vote. It debates and discusses global issues, including questions of war and peace and differences between members.
Security Council: it has fifteen members. Five are permanent (the US, Russia, the UK, France and China), chosen because they were the most powerful states and the victors after the Second World War; they enjoy permanency and the veto, so one negative vote by any of them stalls a decision. Ten are non-permanent, elected for two years at a time so as to represent all continents, and cannot be re-elected immediately. The Council was enlarged from 11 to 15 in 1965. Its main function is the preservation of international peace and security.
Secretariat: it handles the administration and coordination of UN affairs and is headed by the Secretary-General, the UN's most visible public figure and representative head; Antonio Guterres, the ninth, took office on 1 January 2017.
Relevance: in an interdependent world of more than seven billion people, problems like epidemics, terrorism and climate change cross borders. The UN is imperfect and was slow in crises such as Lebanon in 2006, but it remains the only forum where nearly all states can talk, cooperate and settle differences without war; without it the world would be worse off.
Where students lose marks in Evolution and Structure of the UN
The slips examiners see most often, and what to write instead.
Mistake: Calling agencies organs
Both are 'parts of the UN' in students' minds.
Wrong working
Principal organs: General Assembly, Security Council, UNESCO, WHO.
Right working
Organs: General Assembly, Security Council, Secretariat, ECOSOC, ICJ, Trusteeship Council. UNESCO and WHO are agencies.
Do this: Learn the six organs as one fixed list.
Usually costs: 1-2 marks.
Mistake: Wrong founding numbers
Mixing 26, 50, 51 and 193.
Wrong working
The UN was founded by 26 nations.
Right working
26 Allies signed the 1942 Declaration; 50 signed the Charter; Poland made 51; 193 members by 2011.
Do this: Tie each number to its event.
Usually costs: 1 mark.
Mistake: Vague composition
Writing 'some permanent and some temporary members'.
Wrong working
The Security Council has a few big countries and some others.
Right working
5 permanent (named) with veto; 10 non-permanent, two-year terms, no immediate re-election.
Do this: Always give numbers and names.
Usually costs: 1-2 marks in a 6-mark answer.
Mistake: Treating the UN as a world government
Assuming it can order states.
Wrong working
The UN should have forced Israel to stop at once.
Right working
The UN is not a super-state; it acts only as members, especially the P5, allow.
Do this: Use NCERT's 'not a super-state' idea when judging its failures.
Usually costs: Quality marks in evaluation questions.
Exam tips
- Asked in: 2025 board paper 59/5/1 Q28(b) (6 marks, composition and functions of the Security Council); 2026 board paper 59/1/1 Q27(a) (6 marks, composition and one function of three organs); 2026 board paper 59/5/1 Q13 (2 marks, four principal organs); 2024 board paper 59/1/1 Q15 (2 marks, two advantages of international organisations). Answers here are our own.
- Anchor chronology on 1945; the World Bank (1944) came earlier, the IAEA (1957) and WTO (1995) later.
- Name the P5 in full; Japan, Germany and India are common wrong options.
- Use one Secretary-General fact only if asked; do not pad answers with the whole list.
- End evaluation answers with a balanced line: imperfect, yet indispensable.
Practice questions on Evolution and Structure of the UN
Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.
Q1 · 1 mark · MCQBoard level
Pick the country that does not hold a permanent seat on the Security Council.
(a) France
(b) China
(c) Germany
(d) RussiaHint
Victors of 1945.
Answer
(c) Germany.
Q2 · 2 marks · Very short answerBoard level
List four of the UN's principal organs and give the role of one of them. (2 marks)
Hint
Organs, not agencies.
Answer
General Assembly, Security Council, Secretariat, Economic and Social Council (also the International Court of Justice and the Trusteeship Council). For example, the International Court of Justice resolves disputes between member countries.
Q3 · 4 marks · Short answerHarder board level
What were the UN's objectives when it was founded in 1945? Explain. (4 marks)
Hint
Prevent, limit, cooperate, develop.
Answer
The UN was meant to do what the League of Nations could not. First, to prevent international conflict, so that quarrels between states do not escalate into war. Second, if war did break out, to limit the extent of the fighting. Third, to facilitate cooperation among states on matters they cannot handle alone. Fourth, because conflicts often arise from a lack of social and economic development, to bring countries together to improve development prospects all over the world, which it does through agencies such as WHO, UNDP, UNICEF and UNHCR.
Q4 · 2 marks · Very short answerHarder board level
How are non-permanent members of the Security Council different from permanent members? Give two differences. (2 marks)
Hint
Term and veto.
Answer
(i) Non-permanent members are elected for two years at a time and cannot be re-elected immediately, while permanent members hold their seats permanently. (ii) Non-permanent members have no veto, while any permanent member can block a decision with its negative vote.
Q5 · 1 mark · Assertion-reasonHarder board level
Assertion (A): The UN can compel its member states to obey its decisions in all matters.
Reason (R): An international organisation is created by states and responds to them.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.Hint
Is it a super-state?
Answer
(d) A is false but R is true: the UN is not a super-state with authority over its members.
Q6 · 4 marks · Short answerHOTS / competency
Suppose a classmate says the UN is useless because it could not stop the 2006 attack on Lebanon. Write a reply of about 100 words that accepts part of the criticism but defends the UN. (4 marks)
Hint
Concede, then three defences.
Answer
Your criticism is partly fair: the UN passed a resolution only in August 2006, two months after Israel attacked Lebanon, and Israeli troops withdrew only in October, while many civilians died. But the UN is not a super-state; it can act only as far as its member states, especially the permanent five, allow. Judging it by one failure ignores what it does: most disputes between states are settled without war, often with its help; it brings almost every country together on problems like epidemics and climate change; and its agencies work for health, children and refugees. As Hammarskjold said, it exists to save us from hell, not to deliver heaven.
Q7 · 6 marks · Long answerHOTS / competency
"The structure of the UN still reflects the world of 1945." Examine this statement with reference to the Security Council, and suggest how far the UN has adapted. (6 marks)
Hint
P5 chosen as victors; size changed once; new organs and agencies.
Answer
The statement has much truth. The five permanent members, the US, Russia, the UK, France and China, were chosen because they were the most powerful states and the victors of the Second World War, and they still hold permanency and the veto. Germany, Japan and large developing countries such as India have no permanent seat. The Council was enlarged only once, from 11 to 15 members in 1965, with no new permanent members, while the General Assembly grew to 193 members, mostly developing countries. Africa and South America have no permanent representation.
Yet the UN has adapted in other ways. The General Assembly gives every state one vote. Non-permanent members are elected for two-year terms to represent all continents. Agencies such as WHO, UNDP, UNICEF and UNHCR have taken on development and humanitarian work, and in 2005 members agreed to create a Peacebuilding Commission and a Human Rights Council and to wind up the Trusteeship Council, whose job had ended. Secretaries-General from Asia, Africa and Latin America have led it.
So the UN has adapted its work and agencies, but the core of power, the Security Council, still mirrors 1945. That gap is why reform of the Council dominates debates about the UN today.
Test your recall
Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.
1.When is UN Day?Show answer
24 October, the day the UN was founded in 1945.
2.When did India join the UN?Show answer
30 October 1945.
3.Which organisation did the UN succeed?Show answer
The League of Nations.
4.How many members did the UN have by 2011?Show answer
193.
5.When was the Security Council enlarged from 11 to 15 members?Show answer
1965.
6.Who is the ninth Secretary-General, according to NCERT?Show answer
Antonio Guterres of Portugal, from 1 January 2017.
Evolution and Structure of the UN: frequently asked questions
Why was the UN created?
To prevent international conflict, limit wars that break out, and promote cooperation and development, succeeding the League of Nations, which failed to stop the Second World War.
What are the principal organs of the UN?
The General Assembly, Security Council, Secretariat, Economic and Social Council, International Court of Justice and Trusteeship Council (which members agreed in 2005 to wind up).
Who are the permanent members of the Security Council?
The United States, Russia, the United Kingdom, France and China.
Is the UN a world government?
No. NCERT stresses it is not a super-state; states create it and it responds to them.