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World War I: The Great War

Students investigate how a single assassination pulled the world’s great powers into an unprecedented, devastating war — analyzing the deeper MAIN causes (militarism, alliances, imperialism, nationalism) and the grim reality of trench warfare.

Grade 9Modern World55 minutes1 class periodC3 InquiryExplicit teaching4 StandardsC3 + CCSS
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Lesson at a Glance

Everything you need before the bell rings

Learning Objectives

Students will be able to…

  • ✓Explain the MAIN causes of WWI.
  • ✓Distinguish long-term causes from the trigger.
  • ✓Describe trench warfare.
  • ✓Analyze the war’s consequences.
Essential Question

How did the murder of one man in 1914 spiral into a war that killed millions and reshaped the world? The spark was small — but the causes ran deep.

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Lesson Phases
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Vocabulary Terms
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Standards Aligned
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Interactive Task
Causes Explorer · Interactive

The Causes Explorer

Project this and tap each cause of World War I. Have students distinguish the deep, long-term causes from the spark that set them off.

🎖️ Explore the causes of WWI — tap eachTry it

The Lesson · C3 Inquiry Arc (Question · Investigate · Conclude)

55 minutes, five moves

Tap any phase to open the teacher moves and student actions.

1

Compelling Question — A Small Spark

5 min

How did one assassination pull the whole world into war?

👩‍🏫 Teacher Moves

  • Note the small trigger, huge war.
  • Ask what made it possible.
  • Pose the question.

🎒 Student Actions

  • Consider the spark.
  • Wonder how.
  • Predict the causes.
2

Investigate — Explore the Causes

12 min

Students investigate.

👩‍🏫 Teacher Moves

  • Send students to the Causes Explorer.
  • Record each MAIN cause.
  • Separate causes from the trigger.

🎒 Student Actions

  • Tap each cause.
  • Record it.
  • Find the trigger.
3

Analyze — Deep Causes vs. Trigger

13 min

Students analyze.

👩‍🏫 Teacher Moves

  • Explain militarism, alliances.
  • Explain imperialism, nationalism.
  • Explain the spark and trench warfare.

🎒 Student Actions

  • Explain the causes.
  • Explain the alliances.
  • Explain the trenches.
4

Draw Conclusions — Draw Conclusions

15 min

Students conclude.

👩‍🏫 Teacher Moves

  • Weigh which cause mattered most.
  • Distinguish long-term vs. trigger.
  • Support with evidence.

🎒 Student Actions

  • Rank a cause.
  • Separate the types.
  • Use evidence.
5

Take Informed Action — Consequences

5 min

Students take action.

👩‍🏫 Teacher Moves

  • Trace WWI’s effects (Versailles, new borders).
  • Explain a lasting impact.
  • Hand out the exit ticket.

🎒 Student Actions

  • Trace the effects.
  • Explain the impact.
  • Complete the exit ticket.
Standards Alignment

Built to the standards you report on

Aligned to the C3 Framework for Social Studies (Grades 9–12) and Common Core literacy in history/social studies.

C3
D2.His.14.9-12

Analyze multiple and complex causes and effects of events in the past.

C3
D2.His.15.9-12

Distinguish between long-term causes and triggering events.

C3
D2.Geo.6.9-12

Evaluate the impact of human settlement and conflict on regions.

CCSS
RH.9-10.2

Determine the central ideas of a source and provide an accurate summary.

Differentiation

One lesson, every learner

Multilingual Learners

ELL / EMERGING READERS
  • Cause picture/vocab cards (MAIN).
  • Sentence frame: “___ caused tension because ___.”
  • Map the alliances.

Support & Access

IEP / 504
  • Focus on the MAIN acronym.
  • Provide a causes chart.
  • Separate spark from causes.

Stretch & Extend

GIFTED / EARLY FINISHERS
  • Analyze the Treaty of Versailles.
  • Explain how WWI led to WWII.
  • Research trench-warfare technology.
Materials

What to gather

  • 📽️Projector / board
  • 📓Notebooks
  • 💻The Causes Explorer
  • 🗺️A 1914 Europe map
  • ✏️Pencils
  • 🎫Exit-ticket slips
Vocabulary

Key terms — hover for a quick definition

militarismglorifying military power and buildupalliancean agreement to support other nationsimperialismbuilding empires and coloniesnationalismintense pride in one’s nationtrench warfarefighting from dug-in trenchesno man’s landthe deadly ground between trenchesarmisticean agreement to stop fightingTreaty of Versaillesthe 1919 treaty ending WWI
Evaluate

Exit Ticket

Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.

QUESTION 1
What do the letters MAIN stand for as causes of WWI?
Militarism, Alliances, Imperialism, and Nationalism.
QUESTION 2
What event triggered the start of World War I?
The assassination of Archduke Franz Ferdinand in 1914.
QUESTION 3
What was trench warfare?
A grueling form of fighting from dug-in trenches, with soldiers separated by deadly “no man’s land,” leading to years of deadlock and huge casualties.

Going deeper? The road to WWII.

Have students analyze how the harsh Treaty of Versailles and WWI’s aftermath helped set the stage for World War II. A printable cause-and-effect sheet is in the Social Studies library.

Study · Flashcards

Study the key terms

Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.

🃏 World War IFlip
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Practice · Quiz

Check your understanding

A quick self-check with instant feedback, drawn from this lesson’s key terms.

📝 World War IQuiz
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Practice · Worksheet

Printable worksheet

A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.

🖨️ World War IPrint
Name: ________________________
Date: ____________

Part A · Write the word that matches each meaning

Word bank: alliance, armistice, imperialism, militarism, nationalism, no man’s land, Treaty of Versailles, trench warfare
  1. building empires and colonies
  2. glorifying military power and buildup
  3. the 1919 treaty ending WWI
  4. intense pride in one’s nation
  5. an agreement to support other nations
  6. the deadly ground between trenches
  7. fighting from dug-in trenches
  8. an agreement to stop fighting

Part B · Show what you learned

  1. What do the letters MAIN stand for as causes of WWI?
  2. What event triggered the start of World War I?
  3. What was trench warfare?
Answer key — Part A: 1) imperialism · 2) militarism · 3) Treaty of Versailles · 4) nationalism · 5) alliance · 6) no man’s land · 7) trench warfare · 8) armistice
Part B: 1) Militarism, Alliances, Imperialism, and Nationalism. 2) The assassination of Archduke Franz Ferdinand in 1914. 3) A grueling form of fighting from dug-in trenches, with soldiers separated by deadly “no man’s land,” leading to years of deadlock and huge casualties.