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  1. Causes of World War I - Wikipedia

    Identifying the causes of World War I remains a debated issue. World War I began in the Balkans on 28 July 1914, and hostilities ended on 11 November 1918, leaving 17 million dead and 25 million wounded.

  2. The Causes of WWI - World History Encyclopedia

    May 15, 2025 · What were the three main causes of WWI? The three main causes of WWI were Germany's imperialist ambitions, a rise in nationalist independence movements in the Balkans, and a …

  3. Top 5 Causes of World War I - ThoughtCo

    May 18, 2024 · What were the main causes of World War I? Learn about how mutual defense alliances, imperialism, militarism, and nationalism all played a part.

  4. World War I: Summary, Causes & Facts | HISTORY

    Oct 29, 2009 · World War I, also known as the Great War, started in 1914 after the assassination of Archduke Franz Ferdinand of Austria. His murder escalated into a war across Europe that lasted until …

  5. Six Causes of World War I - Norwich University Online

    Though the assassination of Archduke Ferdinand was the direct precipitating event leading to the declaration of war, there were many other factors that also played a role in leading up to World War I …

  6. The Main Causes of WW1 - WorldAtlas

    Nov 13, 2025 · The most direct cause was the assassination of Austria-Hungary's Archduke on June 28, 1914. However, the deeper roots can be traced to alliances, militarism, imperialism, and nationalism.

  7. World War I | Causes, Years, Combatants, Casualties, Maps ...

    Mar 28, 2026 · What was the main cause of World War I? World War I began after the assassination of Austrian archduke Franz Ferdinand by South Slav nationalist Gavrilo Princip on June 28, 1914.

  8. The causes of World War I: Explained simply - History Skills

    Discover the four main causes of World War I—militarism, alliances, imperialism, and nationalism. Learn how tensions in Europe made global conflict unavoidable.

  9. Causes of the First World War: A literature review

    Feb 26, 2025 · Nationalism and imperialism are often cited as fundamental causes of World War I, as they fostered rivalries and conflicts of interest among Europe’s great powers in the decades before …

  10. The causes of the First World War - Imperial War Museums

    The causes of the First World War are complex, they're still debated to this day. The nations didn't realize it at the time, but their attempts to defend what they perceived as their own national interests …