The Dominoes of Disaster: Unraveling the Causes of World War II
Target Learner: Grade 9–10 / Age 15 (Homeschool, Classroom, or Independent Study) | Duration: 60–75 Minutes
Materials Needed
- 10–12 physical dominoes, Jenga blocks, or index cards (to create a physical domino chain)
- Large sheet of poster board, butcher paper, or a digital whiteboard app (Canva, JamBoard, or Miro)
- Colored markers or highlighters
- Printed or digital copies of the "Primary Source Snippet Cards" (included in lesson text)
- Device with internet access for optional 3-minute video clip
Lesson Objectives & Success Criteria
Learning Objectives
- Identify & Explain: Analyze the 5 major long-term and short-term causes of WWII (Treaty of Versailles, Rise of Totalitarian Dictators, Imperialism/Expansion, Failure of Appeasement, and the League of Nations).
- Evaluate Connections: Demonstrate how economic depression and post-WWI resentment created a chain reaction that made WWII virtually inevitable.
- Synthesize & Formulate Arguments: Defend a claim regarding which single catalyst was the critical "tipping point" for global conflict.
Success Criteria
- I can explain the acronym T.R.I.P.S. (Treaty, Rise of Dictators, Imperialism, League Problems, Stop Policy/Appeasement).
- I can accurately categorize historical quotes and events into their corresponding cause.
- I can build a visual or physical "Domino Chain" connecting 5 key events and present a 2-minute pitch explaining my arrangement.
1. Introduction: The Hook & Scenario (10 Minutes)
Interactive Scenario — "The Unfair Penalty":
Imagine this: You and three friends play a high-stakes competitive game. Afterwards, the host arbitrarily decides you lost, forces you to give away all your equipment, pay for everyone else's snacks for the next ten years, and bans you from entering the room where rules are made. Meanwhile, a massive economic slump hits, and you lose your job. A smooth-talking guy walks up to you and says, "Join my club. We're going to take back our gear, ignore their rules, and make our group the top dog again." What do you do?
Educator Script / Talking Point:
"Heidi, that scenario is almost exactly what happened to Germany after World War I. World War II didn't just happen out of nowhere because people woke up one day and decided to start the biggest conflict in human history. It was the result of a massive domino effect—a series of bad policy choices, bitter revenge, ruined economies, and unchecked bullies. Today, we're going to act as historical detectives to figure out how these dominoes were set up, and who knocked over the first one."
2. Body: Guided Content & Application (45 Minutes)
Phase 1: Direct Instruction — "I Do" (15 Minutes)
Introduce the 5 Major Causes using the T.R.I.P.S. Framework. Write these on a central board or card setup as you speak.
| Cause (T.R.I.P.S.) | The Real-World Context (15-Year-Old Lens) | Key Historical Detail |
|---|---|---|
| T - Treaty of Versailles (1919) | The ultimate sore winner move. Left Germany broke, embarrassed, and looking for revenge. | War Guilt Clause, $33 billion in reparations, military disarmed. |
| R - Rise of Totalitarian Dictators | Extreme times breed extreme leaders. When the Great Depression hit, people traded freedom for promises of power and security. | Hitler (Germany), Mussolini (Italy), Tojo (Japan), Stalin (USSR). |
| I - Imperialism & Aggression | Countries grabbing land by force because they felt entitled to resources and glory. | Japan invades Manchuria (1931), Italy invades Ethiopia (1935), Germany takes Austria & Czechoslovakia. |
| P - Powerless League of Nations | A security guard with no enforcement power. They blew whistles and wrote stern letters, but had no army to stop aggressive nations. | US didn't join; League couldn't enforce sanctions or stop invasions. |
| S - Stop Policy Failed (Appeasement) | Giving a bully your lunch money in hopes they won't steal your backpack. Spoiler: It just makes them hungrier. | Munich Conference (1938): Britain and France give Hitler the Sudetenland to avoid war. |
Phase 2: Guided Practice — "We Do" (15 Minutes)
Primary Source Snippet Detective: Work together to match the following real historical evidence cards to one of the T.R.I.P.S. causes.
Snippet A:
"In our hands is peace with honor. I believe it is peace for our time."
— British PM Neville Chamberlain, 1938, after handing over parts of Czechoslovakia to Hitler.
Snippet B:
"German people had to burn their money in stoves to warm their homes because hyperinflation rendered the Reichsmark worthless."
— Historical account of 1923 Germany economic crisis.
Snippet C:
"It is us today; it will be you tomorrow. God and history will remember your judgment."
— Emperor Haile Selassie of Ethiopia, appealing to the League of Nations for help against Italian invasion (1936).
(Discussion Guide: Snippet A = Appeasement; Snippet B = Treaty of Versailles/Economic Crisis; Snippet C = Powerless League of Nations & Imperialism).
Phase 3: Independent Application — "You Do" (15 Minutes)
Activity: "The Domino Chain Strategy"
Task: Heidi will create a physical or visual "Domino Chain" connecting 5 critical events that led to the invasion of Poland on September 1, 1939 (the official start of WWII).
Steps for the Learner:
- Label 5 physical dominoes, blocks, or paper cards with 5 specific historical causes/events (e.g., 1. Treaty of Versailles, 2. Great Depression, 3. Hitler becomes Chancellor, 4. Annexation of Austria/Sudetenland, 5. Invasion of Poland).
- Set up the dominoes in a row on a poster board or desk.
- Draw lines or write short "Connectors" between each domino showing WHY Domino #1 directly tipped over Domino #2.
- The Challenge: Remove ONE domino from the middle. Be ready to explain whether WWII still would have happened without that specific domino!
3. Conclusion & Synthesis (10 Minutes)
The 2-Minute Elevator Pitch:
Have Heidi knock over her domino chain and give a quick 90-second "pitch" answering this core historical question:
"If you could travel back in time and change ONE of these causes to prevent WWII, which one would you change and why?"
Educator Summary & Wrap-Up:
"Great work today, Heidi. History isn't just a list of random dates; it’s a chain reaction. The Treaty of Versailles created anger, economic chaos let dictators take power, weak international bodies couldn't stop aggressive land-grabs, and appeasement gave aggressors the green light. When Germany invaded Poland in 1939, the last domino fell, and war was declared."
Assessment & Feedback Mechanisms
Formative Assessment (During Lesson)
- Observation during the "We Do" snippet matching activity. Check for correct categorization using the T.R.I.P.S. framework.
- Check-in questions during the Domino building phase to ensure causal relationships make logical sense.
Summative Assessment (End of Lesson)
- Domino Chain & Pitch: Evaluation of the completed visual/physical domino chain based on accuracy of cause placement and logical connection explanations.
- 3-2-1 Exit Ticket: Written or verbal response: 3 causes recalled, 2 aggressive actions taken by Axis powers, 1 big historical takeaway.
Adaptations & Differentiation
For Support / Scaffolding:
- Provide pre-printed cause-and-effect event cards so the student focuses on arranging and analyzing rather than writing.
- Watch a 3-minute video summary (e.g., *Crash Course World History*) prior to the "I Do" section to build background knowledge.
For Extension / Advanced Learner:
- Alternative History Task: Write a 1-page "What If?" scenario: How would world history look today if the League of Nations had military power to stop Mussolini in Ethiopia in 1935?
- Research Japan's unique motivations in the Pacific (militarism, lack of natural resources, oil embargoes) and add a parallel "Pacific Theater" domino chain.
Adaptation for Classroom/Group Settings:
- Divide students into 5 groups, assigning each group one letter of the T.R.I.P.S. acronym to research and present to the rest of the class as "advocates" for why their cause was the primary driver of the war.