Learn on PengiWorld History and GeographyChapter 27: World War I and the Russian Revolution, 1914–1919

Lesson 1: World War I Begins

In this Grade 5 World History and Geography lesson, students explore the key factors that triggered World War I, including nationalism, imperialism, militarism, and the alliance system of the Triple Alliance and Triple Entente. Students learn how conscription expanded European armies, how mobilization plans limited political leaders' options, and how the assassination of Archduke Francis Ferdinand set the war in motion. The lesson is part of Chapter 27 covering World War I and the Russian Revolution from 1914 to 1919.

Section 1

Nationalism and Imperialism Fuel European Tensions

Nations competed for power and colonial possessions while ethnic minorities sought independence. This competition created rivalries and conflicts among European states, setting the stage for war. (26 words)

Section 2

Militaries Grow and Alliances Form Across Europe

Countries established conscription, doubled army sizes, and created complex mobilization plans. Meanwhile, two major alliance systems emerged: the Triple Alliance and Triple Entente, intensifying international tensions. (27 words)

Section 3

Assassin's Bullet Triggers Global Conflict

When Serbian terrorist Gavrilo Princip killed Archduke Francis Ferdinand in Sarajevo, Austria-Hungary declared war on Serbia with Germany's support, activating a chain reaction of alliances that engulfed Europe in war. (32 words)

Section 4

Military Plans Force Nations Into Broader War

Rigid mobilization schedules and predetermined battle plans like Germany's Schlieffen Plan eliminated flexibility. Political leaders made decisions based on military requirements rather than diplomatic solutions, expanding the conflict. (28 words)

Book overview

Jump across lessons in the current chapter without opening the full course modal.

Continue this chapter

Chapter 27: World War I and the Russian Revolution, 1914–1919

  1. Lesson 1Current

    Lesson 1: World War I Begins

  2. Lesson 2

    Lesson 2: World War I

  3. Lesson 3

    Lesson 3: The Russian Revolution

  4. Lesson 4

    Lesson 4: World War I Ends

Lesson overview

Expand to review the lesson summary and core properties.

Expand

Section 1

Nationalism and Imperialism Fuel European Tensions

Nations competed for power and colonial possessions while ethnic minorities sought independence. This competition created rivalries and conflicts among European states, setting the stage for war. (26 words)

Section 2

Militaries Grow and Alliances Form Across Europe

Countries established conscription, doubled army sizes, and created complex mobilization plans. Meanwhile, two major alliance systems emerged: the Triple Alliance and Triple Entente, intensifying international tensions. (27 words)

Section 3

Assassin's Bullet Triggers Global Conflict

When Serbian terrorist Gavrilo Princip killed Archduke Francis Ferdinand in Sarajevo, Austria-Hungary declared war on Serbia with Germany's support, activating a chain reaction of alliances that engulfed Europe in war. (32 words)

Section 4

Military Plans Force Nations Into Broader War

Rigid mobilization schedules and predetermined battle plans like Germany's Schlieffen Plan eliminated flexibility. Political leaders made decisions based on military requirements rather than diplomatic solutions, expanding the conflict. (28 words)

Book overview

Jump across lessons in the current chapter without opening the full course modal.

Continue this chapter

Chapter 27: World War I and the Russian Revolution, 1914–1919

  1. Lesson 1Current

    Lesson 1: World War I Begins

  2. Lesson 2

    Lesson 2: World War I

  3. Lesson 3

    Lesson 3: The Russian Revolution

  4. Lesson 4

    Lesson 4: World War I Ends