🌐 World History

Colonialism, World Wars, Cold War, decolonisation, Revolutions (American, French, Russian), major international institutions — complete GS-1 coverage for UPSC Civil Services

GS Paper 1 (Mains) 18th–20th Century World Wars Cold War
UPSC Syllabus — World History: GS-1 covers "History of the world from 18th century — events from 18th century to the present, Industrial Revolution, World Wars, redrawing of national boundaries, Colonisation, Decolonisation, political philosophies like Communism, Capitalism, Socialism etc." Expect 2–3 direct Mains questions and indirect prelims questions.

1. Industrial Revolution (1760–1840)

AspectDetails
OriginBritain first (1760–1840); then spread to Western Europe, USA, Japan
Preconditions (Britain)Agricultural Revolution (enclosures → surplus labour); mercantile capitalism; colonial raw materials + markets; Protestant work ethic; Glorious Revolution (1688) → stable property rights; coal + iron reserves
Key InventionsSteam engine (James Watt, 1769); Spinning Jenny (James Hargreaves, 1764); Power Loom (Edmund Cartwright, 1785); Steam Locomotive (George Stephenson — Rocket, 1829); Telegraph (Samuel Morse)
PhasesFirst (1760–1840): Textiles, steam, coal, iron; Second (1870–1914): Steel, electricity, chemicals, petroleum, telephone
Social ImpactUrbanisation; rise of working class (proletariat); child labour; poor conditions → labour movements; trade unions; women in factories; Luddite movement (machine-breaking)
Ideological ImpactCapitalism solidified; Socialist/Marxist critique emerged (Marx — Das Kapital 1867); Utopian Socialism (Owen, Saint-Simon); Anarchism; Liberal free-trade ideology
Global ImpactEuropean industrial supremacy → imperialism; colonisation of Asia/Africa for raw materials and markets; widening gap between industrial and agrarian societies

2. American Revolution (1775–1783)

AspectDetails
Causes"No taxation without representation" — British taxes (Stamp Act 1765, Townshend Acts 1767, Tea Act 1773); Enlightenment ideas (Locke — natural rights); Boston Massacre (1770); Boston Tea Party (1773)
Key EventsFirst Continental Congress (1774); Battles of Lexington and Concord (1775 — "shot heard around the world"); Declaration of Independence: July 4, 1776 (Thomas Jefferson); Valley Forge winter 1777–78; Battle of Yorktown (1781 — British surrender)
Declaration of Independence"All men are created equal; endowed with unalienable Rights — Life, Liberty, Pursuit of Happiness"; Enlightenment ideals; Locke's influence; anti-colonial manifesto
OutcomeTreaty of Paris (1783) — British recognised USA independence; US Constitution (1787); Bill of Rights (1791); Federal republic; separation of powers (Montesquieu influence)
Global SignificanceFirst successful colonial independence movement; inspired French Revolution; template for later independence movements including India; republican model spread

3. French Revolution (1789–1799)

AspectDetails
CausesFinancial crisis (American war debt); Estates General inequality (Third Estate 97% population, no vote parity); Enlightenment ideas; bread scarcity; Ancien Régime's rigid hierarchy; Weak king Louis XVI
PhasesConstitutional Monarchy (1789–92) → First Republic (1792) → Reign of Terror (1793–94, Robespierre) → Thermidorian Reaction (1794) → Directory (1795–99) → Napoleon's coup (1799)
Key EventsStorming of Bastille: July 14, 1789 (French national day); Declaration of the Rights of Man (Aug 1789); Women's March on Versailles; Louis XVI guillotined (Jan 1793); Reign of Terror (17,000+ executed)
IdeologyLiberty, Equality, Fraternity (Liberté, Egalité, Fraternité); sovereignty of the people; end of feudalism; church lands nationalised; metric system introduced
Napoleon Bonaparte1799: First Consul; 1804: Emperor; Napoleonic Code (1804) — equality before law, property rights, secular state; European wars; Continental System (blockade of Britain); Grand Army; defeated at Waterloo (1815)
LegacyNationalism spread across Europe; end of absolute monarchy as norm; women's rights inspired; Haitian Revolution (1791–1804, first successful Black republic); inspired Latin American independence

4. Colonialism and Imperialism (19th–20th Century)

CountryMajor ColoniesKey Features
BritainIndia, Australia, Canada, South Africa, Kenya, Nigeria, Egypt, Malaya, Singapore, Hong Kong"Empire on which the sun never sets"; indirect rule where possible; deindustrialisation of India; 1/4 of world's land; free trade imperialism
FranceAlgeria, Morocco, West Africa, Indochina, Syria, MadagascarMission civilisatrice (civilising mission); direct assimilation model; Algerian war (1954–62)
PortugalBrazil (until 1822), Angola, Mozambique, Goa (until 1961)Oldest colonial empire; Goa held until Indian police action 1961
NetherlandsIndonesia (Dutch East Indies), Suriname, South Africa (originally)VOC (Dutch East India Company) pioneered corporate colonialism
BelgiumCongoLeopold II's Congo Free State — rubber slavery, atrocities; 10 million deaths estimated
GermanyNamibia, Tanzania, Cameroon, Togo, New GuineaLost all colonies after WWI (Treaty of Versailles)
JapanKorea (1910–45), Taiwan (1895), Manchuria, SE Asia (WWII)Non-Western imperialist; Meiji Restoration (1868) → industrialisation → imperialism
USAPhilippines (1898–1946), Puerto Rico, Guam, Panama Canal ZonePost-Spanish-American War (1898); Monroe Doctrine (1823) — Latin America as US sphere; neo-colonialism in 20th c.

Theories of Imperialism

TheoristTheory
J.A. Hobson (1902)Imperialism driven by capitalist need for overseas investment; surplus capital seeks returns in underdeveloped world; inspired Lenin
Lenin (1916)"Imperialism, the Highest Stage of Capitalism"; monopoly capital, finance capital exports; imperialism as inevitable outcome of capitalism; inter-imperialist wars inevitable
Kipling"White Man's Burden" (1899) — racist justification: European duty to civilise non-white peoples; cultural imperialism rationale

5. World War I (1914–1918)

AspectDetails
MAIN CausesMilitarism (arms race); Alliances (Triple Entente vs Triple Alliance); Imperialism (competition for colonies); Nationalism (Pan-Slavism, Serbian nationalism, German nationalism)
TriggerAssassination of Archduke Franz Ferdinand (heir to Austro-Hungarian throne) by Gavrilo Princip (Black Hand, Serbian nationalist) at Sarajevo, Bosnia — June 28, 1914
AlliancesAllied/Entente Powers: France, Russia, Britain, Italy (1915), USA (1917), Japan; Central Powers: Germany, Austria-Hungary, Ottoman Empire, Bulgaria
Key EventsSchlieffen Plan (German quick western knockout); trench warfare on Western Front; Gallipoli (1915 — British failure, Anzac sacrifice); Battle of Somme (1916 — 57,000 British casualties on day 1); Battle of Verdun; US enters 1917 (Zimmermann Telegram + unrestricted submarine warfare); Russian withdrawal (Treaty of Brest-Litovsk 1918)
New WeaponsPoison gas (mustard gas), tanks (British, 1916), aircraft (reconnaissance + bombing), submarines (U-boats), machine guns, artillery — industrialised killing
EndArmistice: November 11, 1918; 20 million dead; Treaty of Versailles (June 1919)
Treaty of Versailles (1919)Germany: war guilt clause (Article 231); ₹6.6 billion reparations; loss of 13% territory (Alsace-Lorraine to France; Polish Corridor; colonies); army limited to 100,000; humiliation → Hitler's rise
League of NationsWoodrow Wilson's 14 Points; collective security; no US membership (Senate refused); no USSR initially; no teeth — Germany, Japan withdrew; failed to prevent WWII
India in WWI1.5 million Indian soldiers; Mesopotamia, Gallipoli, Western Front; Home Rule League (1916 — Tilak, Besant); Lucknow Pact (1916); Montagu-Chelmsford reforms (1919)

6. Russian Revolution (1917)

AspectDetails
BackgroundAutocratic Tsarist rule; 1905 Revolution (Bloody Sunday — peaceful protesters shot); Russo-Japanese War defeat (1905); agrarian backwardness; intelligentsia radicalism; Marxist parties
February Revolution 1917Food shortages + WWI deaths → Petrograd strikes + army mutiny; Tsar Nicholas II abdicated; Provisional Government (Kerensky) formed; continued war — fatal mistake
October Revolution 1917Bolsheviks under Lenin ("Peace, Land, Bread"); stormed Winter Palace; Provisional Government overthrown; Soviet (council) power; November 7, 1917 (Old Style: October)
Lenin's InnovationsVanguard party of professional revolutionaries (What Is To Be Done? 1902); Soviets (workers councils) as state power; immediate peace (Treaty of Brest-Litovsk — gave up Ukraine, Poland, Baltic states); land redistribution; War Communism (1918–21); NEP (New Economic Policy 1921 — tactical retreat)
Civil War (1918–21)Reds (Bolsheviks) vs. Whites (counter-revolutionaries + Allied forces); Reds won with Trotsky's leadership; Red Army; famines
Stalin's RiseLenin died 1924; Stalin vs. Trotsky; Stalin won; Five Year Plans (rapid industrialisation); collectivisation (forced — millions died); Gulag system; Great Purge (1936–38 — millions imprisoned/shot); cult of personality
Impact on IndiaInspired Indian communists (CPI founded 1920); Bhagat Singh's socialism; Nehru's socialist ideas; Non-Aligned Movement later shaped by Cold War rivalry

7. World War II (1939–1945)

AspectDetails
CausesVersailles humiliation → German grievances; Great Depression (1929) → political radicalisation; Rise of Fascism (Hitler, Mussolini); Appeasement (Munich Agreement 1938 — Neville Chamberlain); Japanese expansionism; Soviet-Nazi Pact (Molotov-Ribbentrop, 1939)
Hitler's RiseNazi Party (National Socialist German Workers' Party); Mein Kampf; anti-Semitism, pan-German nationalism, anti-Communism; appointed Chancellor 1933; Third Reich; rearmament (violated Versailles)
TimelineSept 1, 1939: Germany invades Poland → Britain, France declare war; May 1940: Fall of France (Dunkirk evacuation); Battle of Britain (RAF vs. Luftwaffe); June 1941: Operation Barbarossa (Germany invades USSR); Dec 1941: Pearl Harbor → USA enters; 1942–43: Battle of Stalingrad (turning point on Eastern Front); June 6, 1944: D-Day (Normandy landing); May 8, 1945: VE Day (Germany surrenders); Aug 6, 9: Atomic bombs on Hiroshima, Nagasaki; Sept 2, 1945: VJ Day
AlliesUSA, USSR, UK, France, China (Nationalist), India (British India); The Big Three: Roosevelt, Stalin, Churchill
Axis PowersGermany (Hitler), Italy (Mussolini), Japan (Hirohito/Tojo); Rome-Berlin-Tokyo Axis (1936)
HolocaustSystematic genocide of 6 million Jews + millions of Roma, disabled, Soviet POWs, homosexuals; Auschwitz, Treblinka, Sobibor death camps; Nuremberg Laws (1935); Kristallnacht (1938); Final Solution (Wannsee Conference 1942)
Atomic BombsManhattan Project (USA — Oppenheimer); Hiroshima (Aug 6, 1945 — "Little Boy"); Nagasaki (Aug 9, 1945 — "Fat Man"); ~200,000 deaths; Japan surrendered; nuclear age began; Cold War arms race
ConferencesTehran (1943); Yalta (Feb 1945 — post-war order); Potsdam (July 1945 — after Germany's surrender)
Post-War OrderUN founded (1945); Bretton Woods (IMF, World Bank); Marshall Plan; Nuremberg Trials; Partition of Germany; Iron Curtain; Cold War beginning
India in WWII3 million+ Indian soldiers; Bengal Famine 1943 (3 million deaths; Churchill's diversion of food); INA (Subhas Chandra Bose, Azad Hind Fauj, with Japan); Quit India Movement 1942
PYQ Themes:
  • 2022: "The causes of WWI were as much economic as political" — critically examine
  • 2021: Compare and contrast the causes and consequences of WWI and WWII
  • Holocaust — significance of Nuremberg Trials for international law
  • Why was the League of Nations less effective than the UN?

8. Cold War (1947–1991)

AspectDetails
DefinitionIdeological and geopolitical rivalry between USA (capitalism, democracy) and USSR (communism, one-party state) without direct military confrontation; proxy wars; arms race; space race
OriginsIdeological incompatibility; post-WWII power vacuum; Soviet expansion in Eastern Europe; Churchill's "Iron Curtain" speech (1946); Truman Doctrine (1947)

Key Cold War Events — Timeline

YearEventSignificance
1947Truman Doctrine; Marshall Plan; India/Pakistan independenceContainment policy; US aid to Europe to resist communism
1948–49Berlin Blockade + AirliftUSSR blocked W. Berlin; US/UK airlifted supplies; first Berlin crisis
1949NATO formed; China becomes Communist (Mao Zedong); USSR tests atom bombMilitary alliances; communism spreads; nuclear balance
1950–53Korean WarUSA/UN vs. North Korea+China; ended in armistice; Korea divided at 38th parallel still
1955Warsaw Pact; Bandung Conference (Non-Alignment)Soviet military alliance; 29 Asian/African nations form Third World bloc
1957Sputnik (USSR — first satellite)Space race began; US felt technological vulnerability
1961Berlin Wall built; Bay of Pigs (Cuba)Division of Germany solidified; failed US-backed Cuban exile invasion
1962Cuban Missile Crisis (Oct 1962)USSR placed nuclear missiles in Cuba; 13-day standoff; Kennedy vs. Khrushchev; closest to nuclear war; resolved diplomatically (US no Cuba invasion pledge; Soviets remove missiles)
1963Partial Nuclear Test Ban Treaty (PTBT)No atmospheric, underwater, outer space tests; first arms control agreement
1969Moon Landing (Apollo 11, Neil Armstrong)USA wins space race milestone; Nixon's détente with China begins
1972Nixon visits China; SALT-I (arms control)Triangular diplomacy; Sino-Soviet split exploited; détente period
1979Soviet invasion of AfghanistanUSSR quagmire ("Soviet Vietnam"); US funded Mujahideen; Reagan Doctrine; USSR drained
1985Gorbachev — Glasnost & PerestroikaOpenness + restructuring → unintended opening; led to USSR dissolution
1989Berlin Wall falls (Nov 9, 1989); Eastern European revolutionsSymbolic end of Cold War; Germany reunified (1990)
1991USSR dissolved (Dec 25, 1991)15 successor states; Russia as heir; USA as sole superpower; End of Cold War

Cold War Doctrines

DoctrineCountryContent
Truman Doctrine (1947)USAUSA will support free peoples resisting subjugation by armed minorities or outside pressures; Greece, Turkey aid; containment begins
Marshall Plan (1948)USA$13 billion economic aid to rebuild Western Europe; prevent communist takeover; George Marshall
Eisenhower Doctrine (1957)USAUS will intervene militarily to protect Middle Eastern nations from communist aggression
Nixon Doctrine (1969)USAUS will provide military aid but expects Asian nations to handle own defence; reduced troops in Asia
Carter Doctrine (1980)USAPersian Gulf vital to US interests; US will use military force to repel Soviet moves in Gulf
Reagan Doctrine (1985)USASupport anti-communist guerrillas worldwide (Nicaragua, Afghanistan, Angola) to roll back Soviet-supported regimes
Brezhnev Doctrine (1968)USSROnce a country becomes socialist, it must remain so; USSR may intervene if socialism threatened (justified Czechoslovakia 1968)

9. Decolonisation (1945–1975)

Region/CountryYear of IndependenceColonial PowerKey Features
India1947BritainPartition; Congress-Muslim League; Gandhi; Nehru; non-violent but violent partition
Indonesia1945/49NetherlandsSukarno declared independence 1945; Dutch returned; war; independence 1949; Bandung Conference 1955
Vietnam1954/1975France → USAHo Chi Minh; Dien Bien Phu 1954 (French defeat); Geneva Accords; division at 17th parallel; Vietnam War (US 1965–75); reunification 1975
Ghana1957BritainFirst sub-Saharan African country; Kwame Nkrumah; Pan-Africanism; "Ghana's independence is meaningless unless linked to total liberation of Africa"
Algeria1962FranceBrutal war of independence (1954–62); FLN vs. France; 1 million Algerians died; Fanon — Wretched of the Earth
Congo1960BelgiumPatrice Lumumba (assassinated with US-Belgian complicity); Mobutu coup; Cold War proxy
Kenya1963BritainMau Mau uprising (1952–60); Jomo Kenyatta; independence under Commonwealth
Angola/Mozambique1975PortugalCarnation Revolution in Portugal (1974) → colonies freed; civil wars followed
Zimbabwe (Rhodesia)1980Britain/White minorityUDI (1965); guerrilla war; Lancaster House Agreement; Mugabe's ZANU
Namibia1990South Africa (German earlier)SWAPO; UN supervised; last African colony to gain independence; Sam Nujoma

Non-Aligned Movement (NAM)

AspectDetails
OriginBandung Conference (1955, Indonesia) — 29 Asian/African nations; 5 founders: Nehru (India), Nasser (Egypt), Sukarno (Indonesia), Tito (Yugoslavia), Nkrumah (Ghana)
1st NAM SummitBelgrade 1961; 25 founding members; Cold War middle path
PrinciplesNon-alignment with military blocs; opposition to colonialism/imperialism; sovereignty; peaceful coexistence; anti-racism (apartheid)
Relevance Today120 members (largest grouping after UN); post-Cold War relevance debated; India's "strategic autonomy" seen as modern NAM; Ukraine war — India abstained

10. Chinese Revolution and People's Republic of China

AspectDetails
BackgroundQing dynasty collapsed (1912); Republic under Sun Yat-sen; warlordism; Japanese invasion (1937); Civil War between CPC (Mao Zedong) and KMT (Chiang Kai-shek)
Long March (1934–35)CPC retreat (6,000+ miles); Mao's leadership consolidated; source of Communist Party legitimacy myth
People's RepublicOct 1, 1949 — Mao proclaimed PRC; KMT fled to Taiwan; US refused recognition for decades; UN seat disputed (China vs. Taiwan) until 1971
Great Leap Forward (1958–62)Forced collectivisation; backyard steel furnaces; agricultural disaster; ~30–45 million deaths (Great Chinese Famine); economic setback
Cultural Revolution (1966–76)Red Guards; destroy "Four Olds"; intellectuals persecuted; Deng Xiaoping purged twice; ~1 million deaths; Gang of Four; Mao's radical phase
Deng Xiaoping (1978–)"Reform and Opening Up"; Four Modernisations (agriculture, industry, S&T, defence); Special Economic Zones; Tiananmen Square (1989 — crackdown on pro-democracy protests); "One country, two systems" for HK/Macau
Sino-Soviet Split (1960)Ideological differences (Khrushchev's de-Stalinisation); territorial disputes; both competing for communist leadership; China aligned with Third World; India sought to exploit but 1962 war changed equation

11. South Africa and Apartheid

AspectDetails
ApartheidAfrikaans for "separateness"; policy of racial segregation by National Party (1948–1994); Blacks, Coloureds, Indians separated from Whites; pass laws; bantustans (homelands); separate amenities
ResistanceANC (African National Congress, 1912); Nelson Mandela (Umkhonto we Sizwe — armed wing); Sharpeville Massacre (1960 — 69 killed, ANC banned); Mandela imprisoned (1964–1990, Robben Island)
International PressureUN sanctions; sports boycott; divestment campaigns; NAM solidarity; India first country to impose sanctions (1946); Cuba sent troops to Angola
End of ApartheidF.W. de Klerk unbanned ANC (1990); Mandela released Feb 1990; negotiations; first multiracial election April 1994; Mandela elected President; Truth and Reconciliation Commission (Archbishop Desmond Tutu)

12. Post-Cold War World (1991–Present)

EventYearSignificance
Gulf War (Operation Desert Storm)1991Iraq invaded Kuwait (1990); US-led coalition expelled Iraq; US military supremacy demonstrated; "New World Order" (Bush Sr.)
Rwandan Genocide1994800,000 Tutsis killed in 100 days; UN failed to intervene; "Never Again" failure; led to UN reform on R2P (Responsibility to Protect)
9/11 Attacks2001Al-Qaeda attacked USA (WTC, Pentagon); Bush declared "War on Terror"; Afghanistan invasion (Oct 2001); Iraq War (2003 — WMD pretext, now discredited)
Arab Spring2010–12Popular uprisings across Arab world (Tunisia, Egypt, Libya, Syria, Yemen, Bahrain); Ben Ali, Mubarak, Gaddafi fell; Syria descended into civil war; ISIS rose from Iraq/Syria chaos
Ukraine Crisis2014/2022Russia annexed Crimea (2014); Russia invaded Ukraine (Feb 24, 2022); NATO-Russia tensions; global food/energy crisis; India's strategic autonomy tested; UNSC paralysed (Russian veto)
Rise of China2000s–presentGDP 2nd largest (2010); BRI (2013); AIIB (2015); South China Sea disputes; 2030 target to be largest economy; US-China rivalry defining 21st century geopolitics
Brexit2016/2020UK voted to leave EU (52:48); Article 50 triggered; UK left EU Jan 2020; Ireland/Scotland implications; UK-EU trade deal; implications for multilateralism
COVID-19 Pandemic2020–22Wuhan, China (Dec 2019); global pandemic; 7 million+ deaths; India's Vaccine Maitri; supply chain disruption; vaccine nationalism; WHO reform debate
Gaza War2023–Hamas attack Oct 7, 2023; Israeli response; 40,000+ Palestinian deaths; ICJ case (South Africa vs. Israel); UN ceasefire resolutions vetoed by US; India's balancing act

13. Post-WWII International Institutions

InstitutionFoundedHQIndia's Role
United Nations (UN)1945 (51 founding members; now 193)New YorkFounding member; largest peacekeeping contributor; UNSC reform bid
IMF1944 (Bretton Woods)Washington DCIndia borrower historically; SDR allocation; calls for quota reform
World Bank (IBRD)1944Washington DCLargest multilateral lender to India; infrastructure, education, health projects
GATT → WTO1947 (GATT); WTO 1995GenevaIndia active negotiator; food security waiver; TRIPS flexibilities for pharma
NATO1949BrusselsIndia not member; NATO expansion debate (Ukraine); India watches carefully
SEATO/CENTO1954/1955—US Cold War alliances; India rejected; Pakistan joined SEATO and CENTO
Non-Proliferation Treaty (NPT)1968—India NOT signatory; 2008 NSG waiver; Article VI (disarmament) India cites
UNFCCC (Paris Agreement)1992 (UNFCCC); 2015 (Paris)Bonn, GermanyNDC commitments; solar alliance; CDRI; net zero by 2070; common but differentiated responsibilities
ICC (International Criminal Court)2002 (Rome Statute 1998)The HagueIndia NOT a signatory; issued warrant for Putin (2023)

14. Political Philosophies — Capitalism, Socialism, Communism, Fascism

PhilosophyCore TenetsKey ThinkersHistorical Examples
CapitalismPrivate ownership; free market; profit motive; limited government; individual freedom; comparative advantageAdam Smith (Wealth of Nations, 1776); Milton Friedman; HayekUSA, UK, post-war Western Europe
SocialismSocial ownership of means of production; planned/mixed economy; redistribution; welfare state; collective responsibilityMarx, Engels (Communist Manifesto 1848); Proudhon; Fabian Society (Shaw, Webb)Scandinavian model; post-independence India (mixed economy)
CommunismNo private property; classless society; state withers away (Marx); vanguard party (Lenin); centralised state control in practiceKarl Marx, Friedrich Engels, Lenin, Mao, GramsciUSSR, China, Cuba, North Korea, Vietnam
FascismUltranationalism; totalitarianism; single-party state; cult of leader; anti-communism; corporatist economy; glorification of violence/warBenito Mussolini (coined term 1919); Georges Sorel; SchmittItaly (Mussolini 1922–43); Germany (Nazism, Hitler 1933–45); Spain (Franco)
LiberalismIndividual rights; civil liberties; democracy; rule of law; free trade; separation of powers; social contractLocke, Mill, Tocqueville, Rawls, Berlin (positive/negative liberty)USA constitution; UK parliamentary model; EU
AnarchismNo state; voluntary cooperation; anti-hierarchical; direct action; property is theft (Proudhon)Proudhon, Bakunin, Kropotkin, Emma GoldmanParis Commune (1871); Spanish Civil War Anarchist factions
Sources: NCERT Class 9–12 (Our Pasts, Themes in World History); Eric Hobsbawm (The Age of Extremes); AJP Taylor (Origins of WWII); Norman Davies (Europe: A History); Jawaharlal Nehru (Glimpses of World History); Paul Kennedy (Rise and Fall of the Great Powers); Oxford Handbook of the History of Communism.