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  1. 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 …

  2. World War I - Encyclopedia Britannica

    6 days ago · 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.

  3. 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 …

  4. The Causes of WWI - World History Encyclopedia

    May 15, 2025 · The event that started WWI was the assassination of Archduke Franz Ferdinand, heir to the Habsburg throne, by a Bosnian Serb nationalist in Sarajevo on 28 June 1914.

  5. 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?

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

    When did World War One begin? On 4 August 1914, Britain declared war on Germany. It became known as The Great War, as it affected people all over the world.

  7. 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.

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

    In 1914, a chain of events set off by the shot of a lone assassin in Sarajevo plunged the world into its first truly global conflict. However, the reasons of this catastrophe ran far deeper than just …

  9. The United States and the First World War - U.S. National Park Service

    In the summer of 1914, the assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian Empire, ignited a continental war between the Central Powers of Germany, Austria …

  10. World War I: Causes and Timeline | HISTORY

    Start Here World War I Battles: Timeline This World War I timeline of battles outlines the most important engagements of the 1914-1918 war, from the first Battle of Mons to the final 1918 …