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World History · CDS

HC21 — Cold War & Decolonization

📚 HC21 · World History – III  ·  Chapter 3 of 3 CDS Level ★ High Priority
📌 CDS Focus: The Cold War is tested on key events (Cuban Missile Crisis, Berlin Blockade, Korean War), doctrines (Truman Doctrine, Marshall Plan), alliances (NATO vs Warsaw Pact), and the dissolution of USSR. Decolonization questions focus on first independent African nations, Kwame Nkrumah (Ghana), Mandela (South Africa), and the link between decolonization and Indian independence. Cuban Missile Crisis and Space Race are direct PYQ topics.
PART A — COLD WAR (1947–1991)

1. Cold War — Overview & Key Doctrines

What is the Cold War? An ideological, political, and economic struggle between the USA (capitalist democracy) and the USSR (communist state) lasting from 1947 to 1991. Neither side directly fought the other — hence "cold" (no direct military conflict between the two). Instead they competed through: proxy wars, arms race, space race, propaganda, and support for rival factions worldwide. The key dividing line was the Iron Curtain — Churchill's term for the Soviet-dominated Eastern Europe.

📌 US Doctrines & Plans

  • Truman Doctrine (1947) — US will support free peoples resisting communist takeover; first applied to Greece and Turkey
  • Marshall Plan (1948) — US economic aid ($12 billion) to rebuild war-devastated Western Europe; prevent communist appeal
  • NATO (1949) — North Atlantic Treaty Organisation; military alliance: USA + Western Europe; "an attack on one is an attack on all"
  • Containment Policy — George Kennan's strategy to contain Soviet expansion without direct war

📌 Soviet Response

  • Cominform (1947) — Communist Information Bureau; coordinated communist parties worldwide
  • Comecon (1949) — Council for Mutual Economic Assistance; Soviet economic bloc
  • Warsaw Pact (1955) — Soviet military alliance; response to NATO; Eastern European satellite states
  • Soviet atomic bomb: 1949 — ended US monopoly; triggered arms race

1.1 Key Cold War Events Maximum PYQs

EventYearSignificance
Berlin Blockade1948–49USSR blocked all land access to West Berlin; USA and UK organised Berlin Airlift (11 months); USSR backed down — major Western propaganda victory
Korean War1950–53North Korea (Soviet-backed) invaded South Korea (US-backed); UN forces led by USA intervened; ended in armistice; Korea remains divided at 38th parallel
Hungarian Revolution1956Hungary tried to leave Warsaw Pact; USSR crushed uprising with tanks; West condemned but did not intervene
Sputnik Launch1957USSR launched world's first satellite — shocked USA; began Space Race; USA accelerated NASA (founded 1958)
Cuban Missile Crisis1962USSR installed nuclear missiles in Cuba; USA blockaded Cuba; 13-day standoff — closest to nuclear war; USSR withdrew missiles; USA pledged not to invade Cuba
Vietnam War1955–75USA supported South Vietnam vs communist North Vietnam + Viet Cong; USA withdrew 1973; Saigon fell 1975; Vietnam reunified under communism
Moon Landing1969NASA's Apollo 11; Neil Armstrong first human on Moon; major US win in Space Race
Berlin Wall Fall1989Symbol of Cold War division; fall marked end of Soviet control over Eastern Europe; Germany reunified 1990
Dissolution of USSR1991Gorbachev's Glasnost + Perestroika; Soviet republics declared independence; USSR formally dissolved 25 December 1991; Cold War ended
⚠ Cold War Traps: (1) NATO formed 1949; Warsaw Pact formed 1955 (6 years later, in response to West Germany joining NATO). (2) Truman Doctrine = political/military; Marshall Plan = economic aid — different policies. (3) Cuban Missile Crisis = 1962 — NOT 1961 (that was Bay of Pigs invasion). (4) First satellite in space = USSR's Sputnik (1957); first human in space = USSR's Yuri Gagarin (1961); first Moon landing = USA's Apollo 11 (1969). (5) USSR dissolved = 25 December 1991.
PART B — DECOLONIZATION

2. Decolonization — Asia & Africa

2.1 Overview & Causes PYQ

Decolonization was the process by which colonial powers withdrew from their colonies, primarily between 1945 and 1975. Key causes: WWII weakened colonial powers (France, Britain, Netherlands); nationalist movements inspired by Enlightenment ideas and Indian independence (1947); UN pressure and newly independent nations' voices; Cold War — both USA and USSR ideologically opposed colonialism; economic cost of maintaining empires.
🌍

India (1947)

Asia's Key Decolonization
  • First major Asian colony to gain independence (15 August 1947)
  • Inspired dozens of subsequent independence movements
  • Gandhi's non-violent model studied worldwide
  • Partition (Pakistan) — showed complexity of decolonization
🌍

Ghana (1957)

First Sub-Saharan African Independence
  • First sub-Saharan African country to gain independence (formerly Gold Coast)
  • Leader: Kwame Nkrumah — Pan-Africanist; first President; called "Osagyefo" (Redeemer)
  • Inspired all of Africa: "If Ghana could do it, so can we"
  • 1960 = "Year of Africa" — 17 African nations became independent
🌍

Algeria (1962)

Violent Decolonization
  • Brutal independence war against France (1954–62)
  • ~1 million killed; 8-year guerrilla war by FLN (Front de Libération Nationale)
  • France had 130 years of colonization; 1 million French settlers (pieds-noirs)
  • Evian Accords (1962) granted independence
  • Symbol of violent decolonization vs India's non-violent model
🌍

South Africa — End of Apartheid

1994
  • Apartheid = racial segregation system (1948–1994) by white-minority Afrikaner government
  • Nelson Mandela — leader of ANC (African National Congress); imprisoned 27 years (1964–1990)
  • Released 1990; Nobel Peace Prize 1993 (with de Klerk)
  • First democratic election: April 1994; Mandela = first Black President
  • South Africa was NOT a direct British/European colony decolonization in the traditional sense

2.2 Key Decolonization Facts PYQ Direct

CountryIndependence YearColonial PowerKey Leader
India1947BritainNehru, Gandhi
Pakistan1947BritainJinnah
Ghana1957BritainKwame Nkrumah
Algeria1962FranceAhmed Ben Bella
Kenya1963BritainJomo Kenyatta
Vietnam1954/1975France (then USA-backed South)Ho Chi Minh
Indonesia1945/1949NetherlandsSukarno
Zimbabwe1980BritainRobert Mugabe

2.3 Space Race — Key Events PYQ

🚀 USSR — Space Firsts

  • Sputnik 1 — first satellite in space (October 1957)
  • Laika — first animal in space (Sputnik 2, November 1957)
  • Yuri Gagarin — first human in space (April 12, 1961)
  • Valentina Tereshkova — first woman in space (June 1963)
  • Alexei Leonov — first spacewalk (March 1965)

🚀 USA — Space Firsts

  • Explorer 1 — first US satellite (January 1958)
  • NASA — founded 1958 in response to Sputnik
  • Apollo 11 — first Moon landing; Neil Armstrong (first person on Moon) + Buzz Aldrin; 20 July 1969
  • Apollo 13 — failed Moon mission (1970); safe return = triumph of engineering
  • Space Shuttle programme (1981–2011)

⚡ HC21 Memory Chart — Fast Revision

🌐 Cold War Doctrines
  • Truman Doctrine (1947) — contain communism
  • Marshall Plan (1948) — $12B economic aid
  • NATO — 1949 (US + W. Europe)
  • Warsaw Pact — 1955 (USSR + E. Europe)
  • Containment — George Kennan's policy
🚀 Cold War Crises
  • Berlin Blockade: 1948–49; Airlift
  • Korean War: 1950–53; 38th parallel
  • Cuba Missile Crisis: 1962 (13 days)
  • Vietnam War: 1955–75; USA withdrew
  • Berlin Wall: built 1961; fell 1989
🛸 Space Race
  • Sputnik (USSR): Oct 1957 — 1st satellite
  • Yuri Gagarin (USSR): 12 Apr 1961 — 1st human
  • Tereshkova (USSR): 1963 — 1st woman
  • Apollo 11 (USA): 20 Jul 1969 — 1st Moon
  • Neil Armstrong — 1st human on Moon
🌍 Decolonization
  • India: 1947; 1st major Asian independence
  • Ghana: 1957; 1st sub-Saharan Africa (Nkrumah)
  • 1960: "Year of Africa" — 17 nations free
  • Algeria: 1962; violent war vs France
  • Kenya: 1963 (Kenyatta)
🔚 End of Cold War
  • Gorbachev — Glasnost + Perestroika
  • Berlin Wall fell: 9 Nov 1989
  • Germany reunified: 1990
  • USSR dissolved: 25 Dec 1991
  • Cold War ended — USA = sole superpower
🌟 Key Leaders
  • Nkrumah — Ghana (Pan-African)
  • Mandela — South Africa (ANC; 27 yr jail)
  • Ho Chi Minh — Vietnam (communist)
  • Sukarno — Indonesia
  • Jomo Kenyatta — Kenya

📄 Topic-Wise PYQs & Tricky Questions

Q1. The 'Truman Doctrine' (1947) was primarily aimed at: CDS PYQ
(a) Rebuilding Europe's economy(b) Containing Soviet communist expansion (c) Creating NATO(d) Ending the Korean War
✔ Answer: (b) Containing Soviet communist expansion
The Truman Doctrine (1947) declared that the USA would support free peoples threatened by communist takeover. It was first applied to Greece and Turkey. The Marshall Plan (also 1947–48) was the economic aid plan for Western Europe. NATO was formed in 1949. The Korean War began in 1950. Truman Doctrine = political/military containment; Marshall Plan = economic support.
Q2. The Cuban Missile Crisis occurred in: CDS PYQ
(a) 1960(b) 1961 (c) 1962(d) 1963
✔ Answer: (c) 1962
The Cuban Missile Crisis occurred in October 1962 — a 13-day standoff between USA (Kennedy) and USSR (Khrushchev) after the US discovered Soviet nuclear missiles being installed in Cuba. It is considered the closest the world came to nuclear war. The crisis ended when the USSR agreed to remove missiles; USA pledged not to invade Cuba. 1961 was the Bay of Pigs invasion (failed US attempt to overthrow Castro).
Q3. Which was the first sub-Saharan African country to gain independence? CDS PYQ
(a) Kenya(b) Nigeria (c) South Africa(d) Ghana
✔ Answer: (d) Ghana
Ghana (formerly Gold Coast) became the first sub-Saharan African country to gain independence in 1957 under Kwame Nkrumah. It was a British colony. Egypt (North Africa) had gained independence earlier, but Ghana was the first Black African nation. 1960 became the "Year of Africa" when 17 African nations gained independence. Kenya became independent in 1963; Nigeria in 1960; South Africa was different — it had self-governance from 1910.
Q4. Yuri Gagarin was the first human in space — in which year? CDS PYQ
(a) 1957(b) 1959 (c) 1961(d) 1969
✔ Answer: (c) 1961
Soviet cosmonaut Yuri Gagarin became the first human to travel to space on 12 April 1961 (now World Space Day) aboard Vostok 1. He orbited Earth once in about 108 minutes. 1957 was Sputnik (first satellite). 1969 was the first Moon landing (USA's Neil Armstrong, 20 July). The USSR led the early space race; the USA won the Moon race.
Q5. NATO was formed in 1949. When was the Warsaw Pact (Soviet military alliance) formed? Tricky
(a) 1947(b) 1949 (c) 1955(d) 1962
✔ Answer: (c) 1955
The Warsaw Pact was formed in 1955 — six years after NATO (1949). The specific trigger was West Germany joining NATO in 1955, which alarmed the Soviets. The Warsaw Pact included USSR, Poland, East Germany, Czechoslovakia, Hungary, Romania, Bulgaria, and Albania. It was dissolved in 1991 along with the USSR. Students often assume both were formed simultaneously.
Q6. Nelson Mandela was imprisoned for: CDS PYQ
(a) 10 years(b) 18 years (c) 27 years(d) 35 years
✔ Answer: (c) 27 years
Nelson Mandela was imprisoned from 1964 to 1990 — 27 years — primarily on Robben Island for his anti-apartheid activities. He was sentenced to life imprisonment in the Rivonia Trial (1964) for sabotage and conspiracy to overthrow the apartheid government. He was released in 1990 when F.W. de Klerk began dismantling apartheid. In 1993, both shared the Nobel Peace Prize. In 1994, Mandela became South Africa's first democratically elected President.
Q7. The Berlin Wall fell in: CDS PYQ
(a) 1987(b) 1989 (c) 1990(d) 1991
✔ Answer: (b) 1989
The Berlin Wall fell on 9 November 1989 — one of the most dramatic moments of the Cold War's end. Built in 1961 to stop East Germans from fleeing to West Berlin, it had divided the city for 28 years. Its fall symbolised the collapse of communist regimes across Eastern Europe. Germany was officially reunified on 3 October 1990. The USSR itself dissolved on 25 December 1991.
Q8. The first human to walk on the Moon was: CDS PYQ
(a) Yuri Gagarin(b) Buzz Aldrin (c) Neil Armstrong(d) Michael Collins
✔ Answer: (c) Neil Armstrong
Neil Armstrong became the first human to walk on the Moon on 20 July 1969 during NASA's Apollo 11 mission. His famous words: "That's one small step for man, one giant leap for mankind." Buzz Aldrin was the second person to walk on the Moon (same mission). Michael Collins orbited the Moon in the command module. Yuri Gagarin was the first human in space (1961) — not on the Moon.

📋 Quick Reference — HC21

🌐 Cold War Alliances
  • NATO: 1949 — US + W. Europe
  • Warsaw Pact: 1955 — USSR + E. Europe
  • Truman Doctrine: 1947 (political)
  • Marshall Plan: 1948 ($12B economic)
  • Containment: George Kennan
🚀 Cold War Events
  • Berlin Blockade: 1948–49
  • Korean War: 1950–53
  • Cuba Missiles: 1962 (13 days)
  • Vietnam: 1955–75 (USA lost)
  • Berlin Wall fell: 1989
🛸 Space Race — Firsts
  • Sputnik — USSR, Oct 1957
  • Yuri Gagarin — USSR, 12 Apr 1961
  • Tereshkova (woman) — USSR, 1963
  • Neil Armstrong (Moon) — USA, 20 Jul 1969
  • NASA founded: 1958
🌍 Decolonization
  • India: 1947 (1st major Asian)
  • Ghana: 1957 (Nkrumah; 1st sub-Saharan)
  • 1960: Year of Africa (17 nations)
  • Algeria: 1962 (France; violent)
  • Kenya: 1963 (Kenyatta)
🌟 Key Figures
  • Mandela — ANC; 27 yrs prison; 1st Black SA president
  • Nkrumah — Ghana; Pan-Africanism
  • Ho Chi Minh — Vietnam communist leader
  • Gorbachev — Glasnost; ended Cold War
🔚 End of USSR
  • Glasnost = openness (Gorbachev)
  • Perestroika = restructuring
  • Berlin Wall fell: 9 Nov 1989
  • Germany reunified: 3 Oct 1990
  • USSR dissolved: 25 Dec 1991
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