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  1. 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 catapulted into a war across Europe that lasted …

  2. World War I - Wikipedia

    At the start of the war, German cruisers were scattered across the globe, some of which were subsequently used to attack Allied merchant shipping. These were systematically hunted down by …

  3. World War I - Encyclopedia Britannica

    Nov 17, 2025 · 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.

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

    In the two decades before WWI started in 1914, there were a number of smaller conflicts and crises that had already threatened to turn into global conflicts. While these didn't start the global war, it does …

  5. How and why did World War One start? - BBC Bitesize

    Discover how country alliances led to World War One and why the great war started in this BBC Bitesize history KS2 guide.

  6. The Causes of WWI - World History Encyclopedia

    May 15, 2025 · Which event started World War I? The event that started WWI was the assassination of Archduke Franz Ferdinand, heir to the Habsburg throne, by a Bosnian Serb nationalist in Sarajevo …

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

    The assassination of Austrian archduke Franz Ferdinand sparked the start of the First World War. But what happened next and why did Britain get involved?

  8. How the War Started - Canada and the First World War

    On 4 August 1914, Canada, as a member of the British Empire, was at war. Canada's contribution to the First World War led to growing autonomy and international recognition, but at great cost.

  9. How did the war begin? | Sir John Monash Centre

    May 6, 2025 · The start of the First World War is generally accepted as 28 July 1914, following the assassination of the Austro-Hungarian Archduke, Franz Ferdinand. But how could an isolated …

  10. Why Did World War I Happen? | CFR Education

    Apr 14, 2023 · World War I was caused by the actions of ordinary people and political leaders. However, World War I was so violent, costly, and traumatic that it is tempting to blame an all-powerful...