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Tamil Nadu Class 10 Social Science Chapter 4 - The World After World War II

Samacheer Kalvi Class 10 Social Science History guide for The World After World War II with Cold War, decolonisation, United Nations, non-alignment, important questions, and revision notes.

Updated 9 May 20262 min read

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Step-by-step answers for all textbook questions in this chapter

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Quick Summary

After World War II, the world changed from European dominance to a new global order. The USA and USSR became superpowers, colonies moved towards independence, and newly independent countries looked for their own path through non-alignment.

Key Areas to Study

  • Cold War and power blocs
  • United Nations and peace efforts
  • Decolonisation in Asia and Africa
  • Non-Aligned Movement
  • Arms race and ideological rivalry
  • New international relations after 1945

Important Concepts

ConceptMeaning
Cold WarRivalry between power blocs without direct world war.
SuperpowerA country with major military, economic, and political influence.
DecolonisationProcess by which colonies became independent.
Non-alignmentPolicy of not joining either major power bloc.

Important Questions

One Mark

  • Name the two superpowers after World War II.
  • What is non-alignment?
  • What is decolonisation?
  • Name an international organisation formed for peace after World War II.

Two Marks

  • Why did the Cold War develop?
  • Mention two aims of the United Nations.
  • Why did Asian and African countries support non-alignment?
  • Write two effects of decolonisation.

Five Marks

  • Explain the features of the Cold War.
  • Describe the changes in the world after World War II.
  • Discuss the importance of the Non-Aligned Movement.

Answer Writing Tip

For five-mark answers, divide the answer into political, military, economic, and colonial changes. This keeps the answer organised and easy to evaluate.

Common Mistakes

  • Calling the Cold War a direct military war between USA and USSR.
  • Forgetting decolonisation.
  • Writing only about Europe and ignoring Asia and Africa.
  • Not explaining why non-alignment was useful.

Revision Checklist

  • Cold War definition prepared
  • USA and USSR blocs revised
  • United Nations role understood
  • Decolonisation examples revised
  • Non-alignment answer practised

Frequently Asked Questions

The Cold War was a period of political, military, and ideological rivalry between the USA-led and USSR-led blocs without direct full-scale war between them.