🇪🇺ap european history review

Causes of WWI

Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examWritten by the Fiveable Content Team • Last updated September 2025

Definition

The causes of World War I refer to the complex set of factors that led to the outbreak of the conflict in 1914, including militarism, alliances, imperialism, and nationalism. These intertwined elements created a tense political climate in Europe, where nations were often on the brink of war due to aggressive foreign policies and deep-seated rivalries.

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5 Must Know Facts For Your Next Test

  1. The assassination of Archduke Franz Ferdinand of Austria in June 1914 is often cited as the immediate spark that triggered WWI, leading to Austria-Hungary's declaration of war on Serbia.
  2. Militarism led to an arms race among the major powers, particularly between Germany and Great Britain, as each sought to outdo the other in military strength and naval power.
  3. The alliance system created a domino effect where local conflicts could escalate into a wider war due to countries being bound by treaties to defend one another.
  4. Imperialism fueled rivalries as European nations competed for colonies and resources around the world, intensifying tensions between countries such as Germany and Great Britain.
  5. Nationalistic fervor drove various ethnic groups within empires, such as Slavs in the Balkans, to seek independence or greater power, creating additional conflicts in the region.

Review Questions

  • How did militarism contribute to the outbreak of World War I?
    • Militarism contributed significantly to the outbreak of World War I by creating an atmosphere where nations felt compelled to build up their armed forces. This arms race led countries like Germany and Great Britain to stockpile weapons and strengthen their military capabilities. As a result, when tensions rose due to events like the assassination of Archduke Franz Ferdinand, nations were quick to mobilize their militaries, escalating a regional conflict into a full-blown world war.
  • Discuss the impact of the alliance system on the escalation of tensions leading to World War I.
    • The alliance system had a profound impact on escalating tensions leading up to World War I by entangling nations in mutual defense agreements. For instance, when Austria-Hungary declared war on Serbia following Ferdinand's assassination, Russia mobilized to defend Serbia due to their Slavic ties and alliance. This action prompted Germany to declare war on Russia, which ultimately pulled other countries into the conflict through a chain reaction of alliances. The rigid alliances made it difficult for nations to de-escalate tensions diplomatically.
  • Evaluate the interplay between nationalism and imperialism as contributing factors to World War I.
    • Nationalism and imperialism were deeply intertwined factors that fueled the lead-up to World War I. Nationalism instilled a strong sense of pride among nations, prompting aggressive foreign policies aimed at expansion and dominance. Countries sought colonies not only for resources but also as a means of asserting their national strength. This competition for imperial power heightened existing rivalries, particularly between Germany, France, and Britain, creating an environment ripe for conflict. The resulting tensions from both nationalism and imperial ambitions made diplomatic resolutions increasingly difficult, setting the stage for global warfare.

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