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  1. AP World History
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Causes of World War I

Ethan Taylor

Ethan Taylor

7 min read

Next Topic - Conducting World War I

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World War I: The Great War for Empires ๐ŸŒ

Let's break down the complex causes of World War I using the handy acronym MANIA, which is quite fitting, isn't it? This guide will help you understand how each factor contributed to the outbreak of this global conflict. We will also highlight key connections between the different units.


Militarism: The Arms Race โš”๏ธ

What is Militarism?

Key Concept

Militarism is the glorification of military power and the aggressive build-up of a nation's armed forces.

Think of it as a competition to see who has the biggest and baddest army. ๐Ÿ‹๏ธ * Industrialization fueled this arms race, allowing nations to produce massive amounts of weapons in a short time. ๐Ÿญ

Historical Context

  • 19th Century: Germany introduced universal conscription in the 1860s, setting the stage for a military build-up across Europe.
  • German Naval Laws (1898-1912): Germany expanded its navy, leading to a naval arms race with Great Britain. ๐Ÿšข
  • Dreadnoughts: Britain responded to Germany's naval build-up by ordering twice as many battleships, escalating tensions. ๐Ÿšข๐Ÿšข
  • 1913: France implemented a 3-year military service law, further intensifying the military build-up.

Key Takeaway

  • By 1914, Europe was a powder keg, with all major powers ready for war. ๐Ÿ’ฅ
  • The Schlieffen Plan (1905) shows that Germany was already planning an attack on France through Belgium, highlighting the aggressive military strategies being developed.

Schlieffen Plan

Caption: The Schlieffen Plan aimed for a swift German victory over France by invading through Belgium.


Alliances: Picking Sides ๐Ÿค

Why Alliances?

  • European nations formed alliances to ensure their safety and gain a strategic advantage. ๐Ÿ›ก๏ธ
  • These alliances also fostered trade among member states. ๐Ÿ’ฐ

The Two Major Alliances

Triple AllianceTriple Entente
Austria-Hungary, Germany, Italy/Ottoman Empire*Britain, France, Russia
*Italy later switched sides and was replaced by the Ottoman Empire.

Key Takeaway

  • The alliance system, intended to prevent conflict, actually dragged nations into war due to a domino effect. ๐Ÿคฏ

Nationalism: Pride and Prejudice ๐Ÿšฉ

What is Nationalism?

Key Concept

Nationalism is a strong sense of pride and devotion to one's nation, often leading to the belief in its superiority.

Think of it like being a super fan of your country. ๐Ÿ“ฃ * It fueled militarism and the desire to expand national glory. ๐Ÿ†

Destabilizing Effect

  • Nationalism destabilized multi-ethnic empires like Austria-Hungary, the Ottoman Empire, and Serbia, as ethnic groups sought independence. ๐Ÿ’”
  • The Balkan Wars (1912-1913) were a direct result of conflicting nationalist aims in the region. โš”๏ธ

Key Takeaway

  • Nationalism created tensions and conflicts within and between nations, contributing to the outbreak of WWI. ๐Ÿ”ฅ

Imperialism: The Scramble for Colonies ๐ŸŒ

What is Imperialism?

Key Concept

Imperialism is the policy of extending a country's power and influence through colonization and control of other territories.

It's like a race to collect as many colonies as possible. ๐Ÿƒ * European powers sought to expand their empires for resources and economic gain. ๐Ÿ’ฐ

Impact on WWI

  • The scramble for colonies in Africa disrupted the balance of power established by the Congress of Vienna. โš–๏ธ
Quick Fact

Imperialism expanded the scope of the war, with battles fought in Africa, Asia, and the Pacific.


Congress of Vienna Cartoon

Caption: A political cartoon representing the Congress of Vienna. Notice how the European leaders are dividing up the world.


Key Takeaway

  • Imperialism increased competition and tensions between European powers, making war more likely. ๐Ÿ˜ 

Archduke's Assassination: The Spark ๐Ÿ’ฅ

The Event

  • On June 28, 1914, Archduke Franz Ferdinand of Austria-Hungary was assassinated in Sarajevo by Gavrilo Princip, a Serbian nationalist. ๐Ÿ˜ฅ
  • Princip was part of the Black Hand, a terrorist group aiming to create an independent Serb state. ๐Ÿ’ฃ

The Domino Effect

  • Austria-Hungary, backed by Germany, issued an ultimatum to Serbia with unreasonable demands. ๐Ÿ˜ 
  • When Serbia refused, Austria-Hungary declared war, triggering a chain reaction. ๐Ÿ’ฅ
  • Russia mobilized its forces in support of Serbia. ๐Ÿ‡ท๐Ÿ‡บ
  • Germany declared war on Russia and then invaded Belgium to get to France. ๐Ÿ‡ฉ๐Ÿ‡ช
  • Great Britain declared war on Germany after the invasion of Belgium. ๐Ÿ‡ฌ๐Ÿ‡ง

Major Players

Allied PowersCentral Powers
Britain, France, Italy, Japan, Russia, Serbia, United StatesAustria-Hungary, Bulgaria, Germany, Ottoman Empire

Key Takeaway

  • The assassination of Archduke Franz Ferdinand was the immediate trigger that set off the chain of events leading to World War I. ๐Ÿ”ฅ

Activity 2: Order Matters!

See if you can order the following World War I events from the earliest to the latest! (A for earliest, E for latest)

______ Austria-Hungary declares war on Serbia ______ Germany declares war on Russia ______ Archduke Franz Ferdinand is assassinated ______ Germany invades Belgium ______ Great Britain enters the war on the Alliesโ€™ side

ANSWERS - Activity 2: Order Matters!

B Austria-Hungary declares war on Serbia

C Germany declares war on Russia

A Archduke Franz Ferdinand is assassinated

D Germany invades Belgium

E Great Britain enters the war on the Alliesโ€™ side


Final Exam Focus ๐ŸŽฏ

High-Priority Topics

  • The causes of WWI (MANIA) are crucial. Understand each factor and how they interconnected.
  • The impact of industrialization on military build-up. ๐Ÿญ
  • The role of nationalism and imperialism in creating tensions. ๐Ÿšฉ๐ŸŒ
  • The alliance system and how it led to a chain reaction. ๐Ÿค
  • The key events that triggered the war. ๐Ÿ’ฅ

Common Question Types

  • Multiple Choice Questions (MCQs): Often test your understanding of specific causes and events. ๐Ÿง
  • Short Answer Questions (SAQs): May require you to explain the connections between different causes. โœ๏ธ
  • Free Response Questions (FRQs): Could ask you to analyze the long-term and short-term causes of the war or compare different perspectives. ๐Ÿ“

Last-Minute Tips

  • Time Management: Quickly identify the main points in each question and answer directly. โฑ๏ธ
  • Common Pitfalls: Avoid vague answers. Be specific with historical terms and examples. ๐Ÿ™…
  • Strategies: Use the acronym MANIA to remember the causes and practice linking them together. ๐Ÿ’ก
Exam Tip

When writing FRQs, remember to clearly state your thesis, use evidence to support your claims, and analyze the significance of the evidence.


Practice Question

Practice Questions

Multiple Choice Questions

  1. Which of the following was NOT a major cause of World War I? (A) Militarism (B) Alliances (C) Communism (D) Imperialism

  2. The Schlieffen Plan was Germany's strategy to: (A) Invade Russia (B) Defeat France quickly through Belgium (C) Establish naval dominance (D) Form a defensive alliance

  3. What event is considered the immediate trigger of World War I? (A) The signing of the Treaty of Versailles (B) The assassination of Archduke Franz Ferdinand (C) The Russian Revolution (D) The sinking of the Lusitania


Short Answer Question

Explain how nationalism and imperialism contributed to the outbreak of World War I.


Free Response Question

Analyze the long-term and short-term causes of World War I. Be sure to include specific examples of each cause in your response.

Scoring Breakdown:

  • Thesis (1 point): A clear, historically defensible thesis that addresses the prompt.
  • Long-Term Causes (2 points): Identification and explanation of at least two long-term causes of the war, such as militarism, alliances, nationalism, and imperialism, with specific examples.
  • Short-Term Causes (2 points): Identification and explanation of at least one short-term cause of the war, such as the assassination of Archduke Franz Ferdinand, with specific examples.
  • Analysis (2 points): Analysis of how the long-term and short-term causes interacted to bring about the war. Explanation of the connections between the causes.
  • Synthesis (1 point): Connects the causes of WWI to a broader historical context, such as the rise of nationalism in the 19th century or the impact of imperialism on global relations.

Good luck on your exam! You've got this! ๐Ÿ’ช

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Previous Topic - Shifting Power After 1900Next Topic - Conducting World War I

Question 1 of 15

What is the best definition of militarism that led to World War I? ๐Ÿ‹๏ธ

A policy of economic cooperation between nations

The glorification of military power and aggressive arms build-up

A system of political alliances aimed at maintaining peace

The desire to establish colonies in other territories