What you'll learn
This topic examines the major events in international relations from the Paris Peace Settlement through to the end of the Cold War. You'll study how tensions between nations developed after World War I, the origins and outbreak of World War II, the emergence of superpower rivalry, and the eventual collapse of Soviet communism. Understanding causation, consequence and different historical interpretations is essential for exam success.
Key terms and definitions
Treaty of Versailles — The 1919 peace settlement between the Allies and Germany which imposed harsh territorial, military and financial penalties on the defeated nation, creating lasting resentment.
Appeasement — The British and French policy in the 1930s of making concessions to Hitler's demands to avoid war, exemplified by the Munich Agreement of 1938.
Collective security — The principle that nations would act together through the League of Nations to prevent aggression by any single state.
Iron Curtain — Winston Churchill's 1946 term describing the political and ideological division between Soviet-controlled Eastern Europe and the democratic West.
Containment — US policy from 1947 onwards aimed at preventing the spread of communism beyond areas already under Soviet control.
Détente — The period of reduced Cold War tensions in the 1970s marked by arms limitation talks and improved diplomatic relations between superpowers.
Glasnost — Gorbachev's policy of openness and transparency in Soviet government from 1985, allowing greater freedom of expression.
Perestroika — Gorbachev's economic restructuring programme attempting to reform the inefficient Soviet command economy through limited market mechanisms.
Core concepts
The Paris Peace Settlement and the League of Nations, 1919–1929
The Big Three — Wilson (USA), Clemenceau (France) and Lloyd George (Britain) — dominated the Paris Peace Conference with conflicting aims. Wilson sought a just peace based on his Fourteen Points, including self-determination and a League of Nations. Clemenceau demanded harsh punishment to weaken Germany permanently. Lloyd George occupied a middle position, wanting Germany punished but not destroyed.
The Treaty of Versailles imposed severe terms on Germany:
- Territorial losses: Alsace-Lorraine to France; West Prussia and Posen to Poland; all colonies removed
- Military restrictions: Army limited to 100,000 men; no air force, submarines or tanks; Rhineland demilitarised
- Financial penalties: War Guilt Clause (Article 231) accepting responsibility; reparations eventually set at £6,600 million in 1921
- Political humiliation: Excluded from League of Nations; forced to accept terms without negotiation
The League of Nations was established with the primary aim of preventing future wars through collective security. Its structure included:
- Assembly: All member states meeting annually
- Council: Permanent members (Britain, France, Italy, Japan) plus rotating members
- Secretariat: Administrative body based in Geneva
Key weaknesses undermined the League from the start. The USA never joined due to Senate isolationism. The League lacked its own armed forces, relying on members to contribute. Unanimous decisions were required, making swift action difficult. Major powers pursued self-interest rather than collective security.
Hitler's foreign policy and the outbreak of World War II, 1933–1939
Hitler's foreign policy aims were outlined in Mein Kampf and subsequent speeches:
- Destroy the Treaty of Versailles
- Unite all German-speaking peoples in a Greater Germany (Grossdeutschland)
- Acquire Lebensraum (living space) in Eastern Europe
- Defeat communism and destroy the Soviet Union
Hitler's territorial expansion proceeded through calculated steps:
1933–1935: Rearmament began secretly then openly; Saar plebiscite returned the region to Germany; conscription reintroduced violating Versailles.
1936: Remilitarisation of the Rhineland violated Versailles and Locarno Treaties. France and Britain protested but took no military action, emboldening Hitler.
1938: Anschluss (union) with Austria achieved in March through intimidation and staged enthusiasm. The Sudetenland crisis followed, with Hitler demanding Czech territory containing three million Germans. The Munich Agreement (September 1938) granted Hitler's demands, representing the high point of appeasement.
1939: Hitler seized the rest of Czechoslovakia in March, destroying the Munich settlement and proving appeasement had failed. He then demanded Danzig and the Polish Corridor. Britain and France guaranteed Polish independence.
The Nazi-Soviet Pact (August 1939) removed Hitler's fear of a two-front war. This cynical agreement between ideological enemies included secret protocols dividing Poland and Eastern Europe into spheres of influence. Germany invaded Poland on 1 September 1939; Britain and France declared war two days later.
Reasons why appeasement failed:
- Underestimated Hitler's ambitions; he viewed concessions as weakness
- Economic problems made Britain and France reluctant to rearm fully
- Memories of World War I created strong public anti-war sentiment
- Belief that Versailles had been too harsh made some German grievances seem legitimate
- Fear of communist Soviet Union made some view Nazi Germany as a buffer
The Cold War, 1945–1972
The Grand Alliance between the USA, USSR and Britain collapsed rapidly after 1945 due to fundamental ideological differences and mutual suspicion. Key causes of Cold War tensions included:
Ideological conflict: Capitalism and democracy versus communism and totalitarianism represented incompatible worldviews. Stalin sought security through a buffer zone of communist states in Eastern Europe. The West viewed this as aggressive expansionism.
Post-war conferences: Yalta (February 1945) showed unity beginning to fracture over Poland's future government. Potsdam (July–August 1945) revealed deeper divisions over German reparations and Soviet control of Eastern Europe.
Soviet expansion in Eastern Europe: Between 1945–1948, communist governments were established in Poland, Romania, Bulgaria, Hungary, Czechoslovakia and East Germany through various combinations of intimidation, rigged elections and coups. Churchill's "Iron Curtain" speech (1946) highlighted the division of Europe.
The Truman Doctrine (1947) committed the USA to supporting "free peoples" resisting communism, specifically providing aid to Greece and Turkey. This marked the formal adoption of containment policy. The Marshall Plan (1947) offered economic aid to rebuild Western Europe, strengthening capitalism and creating markets for US goods whilst preventing communist expansion.
The Berlin Blockade (1948–1949) represented the first major Cold War crisis. Stalin blocked Western access to West Berlin to force the Allies out. The Berlin Airlift supplied the city by air for eleven months until Stalin lifted the blockade. The crisis led to the division of Germany into the Federal Republic (West) and German Democratic Republic (East) and the formation of NATO (1949).
NATO (North Atlantic Treaty Organization) created a military alliance committing members to collective defence. The Soviet response was the Warsaw Pact (1955), formalising the division of Europe into two armed camps.
The Korean War (1950–1953) demonstrated how Cold War tensions could produce "hot wars." North Korea's invasion of South Korea prompted UN intervention led by the USA. Chinese involvement prevented UN victory, and the war ended roughly where it began along the 38th parallel.
The Cuban Missile Crisis (October 1962) brought the superpowers closest to nuclear war. Soviet deployment of missiles in Cuba prompted a US naval blockade. After tense negotiations, Khrushchev agreed to remove missiles in exchange for US pledges not to invade Cuba and secret removal of US missiles from Turkey. This crisis led to improved communication channels (the Moscow-Washington hotline) and renewed interest in arms control.
The Vietnam War (1955–1975) saw increasing US involvement to prevent communist takeover of South Vietnam. By 1969, over 500,000 US troops were deployed. The war became increasingly unpopular domestically due to casualties, costs, and moral questions. The USA withdrew in 1973; communist forces unified Vietnam in 1975, representing a significant containment failure.
Détente and the end of the Cold War, 1972–1991
Détente emerged in the late 1960s and 1970s due to several factors:
- Nuclear parity created "Mutually Assured Destruction" (MAD), making war unthinkable
- Economic pressures encouraged reduced military spending
- The Sino-Soviet split divided the communist bloc
- Vietnam War strained US resources and public support for aggressive containment
Key détente achievements included:
SALT I (Strategic Arms Limitation Talks, 1972): Limited numbers of ICBMs and anti-ballistic missile systems. SALT II (1979): Further restrictions, though never ratified by the US Senate.
Helsinki Accords (1975): 35 nations agreed to respect European borders, human rights, and increase East-West cooperation. Whilst borders remained unchanged, the human rights provisions gave dissidents in Eastern Europe moral and legal grounds for opposition.
Détente collapsed after 1979 due to Soviet invasion of Afghanistan, continuing Soviet human rights abuses, and the election of Ronald Reagan who took a more confrontational approach with increased defence spending.
Mikhail Gorbachev's reforms from 1985 transformed the Cold War:
Glasnost allowed open discussion of problems, undermining communist control of information. Perestroika attempted economic reform but created instability without solving fundamental inefficiencies.
Gorbachev's "new thinking" in foreign policy included:
- Withdrawal from Afghanistan (1988–1989)
- Abandoning the Brezhnev Doctrine, allowing Eastern European states to determine their own futures
- Arms reduction agreements with the USA (INF Treaty 1987, START I 1991)
The collapse of communism in Eastern Europe occurred rapidly in 1989. Poland's Solidarity movement won elections in June. Hungary opened its border with Austria in September. The Berlin Wall fell in November. Czechoslovakia's "Velvet Revolution" and Romania's violent overthrow of Ceaușescu completed the transformation.
The Soviet Union itself dissolved in 1991 following a failed hardline coup against Gorbachev. The Baltic states gained independence, followed by other republics. Boris Yeltsin emerged as leader of the new Russian Federation. The Cold War ended not through military victory but ideological collapse.
Worked examples
Question: Explain why the League of Nations failed to prevent aggression in the 1930s. (8 marks)
Mark-scheme-style answer:
The League lacked enforcement mechanisms to stop aggressor nations. When Japan invaded Manchuria (1931), the League could only issue moral condemnation through the Lytton Report. Without an army and with Britain and France unwilling to impose oil sanctions, Japan simply withdrew from the League in 1933, demonstrating the organisation's impotence.
The absence of major powers undermined the League's authority. The USA never joined due to isolationism, removing the world's strongest economy. Germany and Japan left when condemned, whilst the USSR wasn't invited until 1934. This meant aggressive nations faced no credible opposition from a united international community.
The structure requiring unanimous decisions prevented swift action. The Manchurian crisis took over a year to investigate, by which time Japan had consolidated control. When Mussolini invaded Abyssinia (1935), Britain and France prioritised their relationship with Italy against Hitler over League principles, even proposing the Hoare-Laval Pact to reward aggression, destroying the League's credibility.
Question: How far do you agree that the Marshall Plan was the main reason for increased Cold War tensions in the years 1947–1949? (16 marks)
Mark-scheme-style answer structure:
Introduction: Acknowledge the Marshall Plan's significance whilst indicating other factors contributed to escalating tensions.
Paragraph supporting the statement: The Marshall Plan (1947) offered $13 billion to rebuild Europe but excluded Soviet-controlled states unless they opened their economies to American scrutiny. Stalin viewed this as economic imperialism designed to undermine Soviet influence in Eastern Europe. He forbade Poland and Czechoslovakia from accepting aid, deepening the division of Europe and forcing Eastern bloc states into economic dependence on the USSR through Comecon (1949).
Paragraphs offering alternative explanations: The Soviet consolidation of Eastern Europe through communist takeovers (especially the Czech coup of 1948) alarmed the West more than economic aid. The Berlin Blockade (1948–1949) represented direct Soviet aggression threatening war, prompting NATO's formation. The Truman Doctrine's ideological commitment to containing communism preceded Marshall aid and established confrontation as official policy.
Conclusion: Whilst the Marshall Plan contributed to Cold War tensions by economically dividing Europe and forcing Stalin's hand in Eastern Europe, it formed part of a broader pattern of mutual suspicion and incompatible ideologies. The Berlin crisis and military alliance systems represented more direct confrontation than economic competition.
Common mistakes and how to avoid them
Confusing League of Nations failures: Students often mix up Manchuria and Abyssinia crises. Remember: Manchuria (1931, Japan) came first and involved Asian expansion; Abyssinia (1935, Italy) demonstrated European powers' unwillingness to enforce League principles even on their doorstep.
Oversimplifying appeasement: Avoid presenting appeasement as purely cowardly or stupid. Acknowledge legitimate reasons: war-weariness, economic depression, belief some Versailles terms were unjust, time to rearm. Then explain why it failed given Hitler's actual aims.
Treating the Cold War as inevitable: Examiners reward nuanced understanding. Discuss both ideological incompatibility AND specific trigger events, decisions and misunderstandings. Avoid deterministic language like "destined to happen."
Ignoring chronology in long answers: Cold War questions spanning decades require clear chronological structure. Don't jump between the 1940s and 1980s randomly. Use clear temporal markers: "Initially... By the 1960s... Following détente..."
Neglecting consequences in causation questions: When explaining why something happened, students forget to show it actually did happen. Briefly confirm the outcome before explaining causes.
Writing narrative instead of analysis: Simply describing what happened earns minimal marks. Every paragraph should explicitly answer the question with analytical phrases: "This contributed to... because...", "The significance of this was...", "This suggests that..."
Exam technique for "International Relations, 1919–2005"
Command words matter: "Explain why" requires causes with developed reasoning (aim for three explained factors for 8-mark questions). "How far do you agree" demands a balanced argument evaluating the statement against alternatives (16-mark questions need both sides plus a justified conclusion).
Use specific evidence: Name treaties, dates, individuals and precise details. "Hitler expanded German territory" is vague; "Hitler remilitarised the Rhineland in March 1936, violating both the Treaty of Versailles and the Locarno Treaties" demonstrates knowledge.
Structure 16-mark essays carefully: Introduction (define terms, set context, indicate argument); 2-3 paragraphs supporting the statement; 2-3 paragraphs offering alternative interpretations; conclusion weighing evidence and delivering a justified judgment. Aim for balance even if you ultimately favour one side.
Link factors together: Top-level answers show how causes and consequences interconnect rather than treating them as isolated points. For example: "The failure of appeasement at Munich emboldened Hitler to demand more territory, whilst simultaneously destroying British and French credibility when they finally guaranteed Poland."
Quick revision summary
The Treaty of Versailles created resentment in Germany whilst the League of Nations lacked enforcement power to maintain peace. Hitler's aggressive foreign policy exploited appeasement and international divisions, leading to World War II in 1939. Post-war ideological conflict between capitalism and communism produced the Cold War, manifested in European division, proxy wars, and nuclear standoff. Crises in Berlin, Korea, Cuba and Vietnam demonstrated superpower rivalry. Détente temporarily reduced tensions in the 1970s, but the Cold War only ended with Gorbachev's reforms and the collapse of Soviet communism in 1989–1991, peacefully concluding history's longest ideological confrontation.