Page 30 – Second World War (1939–1945): Causes, Major Events, United Nations & Global Consequences
Introduction
The Second World War (1939–1945) was the largest and most destructive conflict in human history. It involved more than 60 countries and was fought across Europe, Asia, Africa and the Pacific. The war caused unprecedented human suffering, economic destruction and political transformation, ultimately reshaping the modern world.
The war officially began on 1 September 1939, when Germany invaded Poland. Britain and France declared war on Germany shortly afterwards. The conflict ended in 1945 with the defeat of the Axis Powers and led to the establishment of the United Nations to promote international peace and cooperation.
Learning Objectives
- Understand the background and causes of the Second World War.
- Study the major alliances, battles and important events.
- Learn about the role of the United Nations after the war.
- Analyse the political, economic and social consequences of the conflict.
- Prepare effectively for UPSC Prelims and Mains examinations.
Topics Covered
- Background of the Second World War.
- Long-term and immediate causes.
- Axis Powers and Allied Powers.
- Major battles and turning points.
- Holocaust and atomic bombings.
- Formation of the United Nations.
- Political, economic and social consequences.
- UPSC Mains perspective.
UPSC Focus
The Second World War is one of the most important topics in UPSC World History. Questions frequently cover its causes, major events, Axis and Allied Powers, the United Nations, the Holocaust, the use of atomic bombs and the long-term impact on international relations and decolonisation.
Learning Outcomes
- Explain the major causes of the Second World War.
- Differentiate between the Axis Powers and Allied Powers.
- Describe the major events and turning points of the war.
- Evaluate the significance of the United Nations and the global consequences of the conflict.
Part 2 – Causes of the Second World War, Axis Powers, Allied Powers & Major Turning Points
Major Causes of the Second World War
The Second World War was the result of political, economic and military developments after the First World War. The harsh Treaty of Versailles, economic crises and the rise of aggressive dictatorships created conditions that eventually led to global conflict.
Main Causes
- Harsh provisions of the Treaty of Versailles (1919).
- Rise of Fascism in Italy and Nazism in Germany.
- Aggressive expansionist policies of Germany, Italy and Japan.
- Failure of the League of Nations to prevent aggression.
- The Great Depression (1929), which increased political instability.
- Policy of Appeasement adopted by Britain and France.
- German invasion of Poland on 1 September 1939.
Major Alliances
Axis Powers
- Germany
- Italy
- Japan
Allied Powers
- Britain
- France
- Soviet Union (from 1941)
- United States (from 1941)
- China
The conflict gradually expanded into a global war involving countries across Europe, Asia, Africa and the Pacific.
Outbreak of the War
Germany invaded Poland on 1 September 1939. In response, Britain and France declared war on Germany on 3 September 1939, marking the official beginning of the Second World War.
- Germany quickly occupied Poland.
- War spread across Europe.
- The conflict later expanded to North Africa, the Soviet Union and the Pacific region.
Major Turning Points
- Battle of Britain (1940): Britain successfully resisted German air attacks.
- Operation Barbarossa (1941): Germany invaded the Soviet Union.
- Attack on Pearl Harbor (1941): Japan attacked the United States, leading to American entry into the war.
- Battle of Stalingrad (1942–1943): A decisive Allied victory that weakened Germany.
- D-Day (Normandy Landings, 6 June 1944): Allied forces began the liberation of Western Europe.
UPSC Value Addition
- War Began: 1 September 1939.
- Immediate Cause: German invasion of Poland.
- Axis Powers: Germany, Italy and Japan.
- Major Turning Point: Battle of Stalingrad (1942–1943).
- D-Day: 6 June 1944.
Exam Focus
For UPSC, remember the long-term causes of the Second World War, including the Treaty of Versailles, the rise of Fascism and Nazism, and the failure of the League of Nations. Also memorise the Axis and Allied Powers, the immediate cause of the war, and major turning points such as Stalingrad, Pearl Harbor and D-Day.
Part 3 – Holocaust, Atomic Bombings, Formation of the United Nations, Consequences & Global Significance
The Holocaust
The Holocaust was the systematic persecution and mass murder of approximately six million Jews by Nazi Germany under Adolf Hitler during the Second World War. Millions of other victims, including Roma, persons with disabilities, political prisoners and other persecuted groups, were also killed.
- Organised by the Nazi regime.
- Millions were imprisoned in concentration and extermination camps.
- One of the gravest crimes against humanity in modern history.
- Strengthened the global commitment to human rights after the war.
Atomic Bombings
In August 1945, the United States dropped atomic bombs on the Japanese cities of Hiroshima (6 August 1945) and Nagasaki (9 August 1945). These attacks caused immense destruction and loss of life.
- Japan surrendered on 15 August 1945.
- The formal surrender was signed on 2 September 1945.
- The Second World War officially came to an end.
Formation of the United Nations
The United Nations (UN) was established on 24 October 1945 to maintain international peace and security, promote friendly relations among nations and encourage cooperation in solving global problems.
Main Objectives
- Maintain international peace and security.
- Promote human rights.
- Encourage international cooperation.
- Support economic and social development.
- Prevent future global conflicts.
Consequences of the Second World War
Political Consequences
- Defeat of the Axis Powers.
- Emergence of the United States and the Soviet Union as superpowers.
- Beginning of the Cold War.
- Accelerated decolonisation in Asia and Africa.
Economic Consequences
- Large-scale destruction of industries and infrastructure.
- Post-war reconstruction through international assistance.
- Expansion of global economic cooperation.
Social Consequences
- Millions of military and civilian deaths.
- Mass displacement of populations.
- Greater emphasis on human rights and international law.
- Advances in science, medicine and technology during the post-war period.
UPSC Value Addition
- Holocaust: Approximately six million Jews were killed by Nazi Germany.
- Hiroshima: 6 August 1945.
- Nagasaki: 9 August 1945.
- United Nations Established: 24 October 1945.
- Major Long-term Impact: Beginning of the Cold War and rapid decolonisation.
Exam Focus
For UPSC Mains, evaluate the Second World War not only as a military conflict but also as a turning point in global history. Discuss the Holocaust, the atomic bombings, the establishment of the United Nations and the political, economic and social consequences that reshaped the international order after 1945
Part 4 – UPSC Mains Questions & Model Answers
UPSC Mains Question 1 (10 Marks)
Q. Explain the major causes of the Second World War.
Model Answer
The Second World War (1939–1945) was caused by political, economic and military developments after the First World War. The harsh peace settlement, economic crises and aggressive expansionist policies created conditions for another global conflict.
Major Causes:
- Harsh provisions of the Treaty of Versailles.
- Rise of Fascism in Italy and Nazism in Germany.
- Expansionist policies of Germany, Italy and Japan.
- Failure of the League of Nations to prevent aggression.
- Impact of the Great Depression (1929).
- Policy of Appeasement followed by Britain and France.
- German invasion of Poland on 1 September 1939.
Conclusion: The interaction of these political, economic and ideological factors led to the outbreak of the Second World War.
UPSC Mains Question 2 (15 Marks)
Q. Discuss the significance of the United Nations. How did the Second World War contribute to its establishment?
Model Answer
The devastation caused by the Second World War highlighted the need for an effective international organisation to maintain peace and promote cooperation. As a result, the United Nations was established on 24 October 1945.
Main Objectives:
- Maintain international peace and security.
- Promote human rights and fundamental freedoms.
- Encourage friendly relations among nations.
- Support economic, social and humanitarian cooperation.
- Prevent future global conflicts through collective action.
Significance:
- Provided a global platform for diplomacy.
- Promoted peacekeeping and conflict resolution.
- Supported sustainable development and humanitarian assistance.
- Strengthened international cooperation through specialised agencies.
Conclusion: The United Nations remains the most important international organisation working for global peace, security and development.
UPSC Mains Question 3 (15 Marks)
Q. Analyse the political, economic and social consequences of the Second World War.
Model Answer
Political Consequences:
- Defeat of the Axis Powers.
- Emergence of the United States and the Soviet Union as superpowers.
- Beginning of the Cold War.
- Acceleration of decolonisation in Asia and Africa.
Economic Consequences:
- Large-scale destruction of industries and infrastructure.
- Extensive post-war reconstruction.
- Expansion of international economic cooperation.
Social Consequences:
- Millions of military and civilian deaths.
- Mass displacement of populations.
- Greater emphasis on human rights and international law.
- Rapid advances in science and technology.
Conclusion: The Second World War transformed the international political order, accelerated decolonisation and shaped global institutions and international relations for the remainder of the twentieth century.
UPSC Answer Writing Tips
- Begin with a brief introduction mentioning the period (1939–1945).
- Use headings such as Causes, Major Events, Consequences and Conclusion.
- Mention important terms such as Treaty of Versailles, Appeasement, Axis Powers, Allied Powers, Holocaust and United Nations.
- Support your answer with important dates and historical examples.
- Conclude by explaining how the Second World War reshaped modern international relations and global governance.
Part 5 – UPSC Prelims MCQs, Quick Revision & Chapter Summary
UPSC Prelims Practice MCQs
1. The immediate cause of the Second World War was:
- (A) Attack on Pearl Harbor
- (B) German invasion of Poland ✓
- (C) Russian Revolution
- (D) Italian invasion of Ethiopia
2. Which countries formed the Axis Powers?
- (A) Britain, France and USA
- (B) Germany, Italy and Japan ✓
- (C) Germany, Britain and France
- (D) USA, USSR and China
3. The United Nations officially came into existence on:
- (A) 15 August 1945
- (B) 2 September 1945
- (C) 24 October 1945 ✓
- (D) 1 January 1946
4. The atomic bomb was first dropped on:
- (A) Hiroshima ✓
- (B) Nagasaki
- (C) Tokyo
- (D) Kyoto
5. Which event marked a major turning point on the Eastern Front during the Second World War?
- (A) Battle of Britain
- (B) Battle of Stalingrad ✓
- (C) Battle of Waterloo
- (D) Battle of Trafalgar
Quick Revision
- War Duration: 1939–1945.
- Immediate Cause: German invasion of Poland (1 September 1939).
- Axis Powers: Germany, Italy and Japan.
- Allied Powers: Britain, France, Soviet Union, United States and China.
- Pearl Harbor: 7 December 1941.
- D-Day: 6 June 1944.
- Hiroshima: 6 August 1945.
- Nagasaki: 9 August 1945.
- United Nations Established: 24 October 1945.
- Major Impact: Beginning of the Cold War and acceleration of decolonisation.
Chapter Summary
The Second World War was the largest military conflict in history, fought between the Axis and Allied Powers from 1939 to 1945. It resulted in immense human and economic losses, the Holocaust, the use of atomic weapons and the emergence of a new international order. The establishment of the United Nations, the beginning of the Cold War and the acceleration of decolonisation profoundly shaped the modern world.
Next Lesson
Page 31 – Cold War: Origins, Features, Major Crises, Non-Aligned Movement (NAM) and End of the Cold War.
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