Understanding the Causes of World War I: A Teacher Resource
The assassination of Archduke Franz Ferdinand on 28 June 1914 did not, by itself, make a world war inevitable. It triggered a diplomatic crisis amid existing rivalries, military planning and alliances. A good lesson asks pupils to trace decisions made during the July Crisis rather than recite four causes as if they were an automatic formula.
Learning aims
By the end of the lesson, pupils should be able to distinguish a long-term condition from an immediate trigger, place key decisions of 1914 in sequence and use evidence to explain why the conflict widened. This lesson can be adapted for secondary history; check the current specification for your class before using it for examination preparation.
A 90-minute lesson
Starter — 10 minutes. Show the date 28 June 1914. Ask: “Why might a political assassination lead to war between states that were not at the scene?” Collect hypotheses without yet treating any as settled.
Context and timeline — 15 minutes. Give pupils a map of European powers and a short chronology from Sarajevo through the July Crisis to the declarations of war in August. Define *alliance*, *mobilisation* and *ultimatum*. Explain that the alignments and decisions of 1914 were more complex than a simple two-column list of later wartime sides.
Source inquiry — 25 minutes. In groups, investigate one issue: Austria-Hungary's response to Serbia, Russia's mobilisation, German decisions, or British decisions about Belgium. Use an attributed contemporary document or a reliable archive's source pack. For each source, record its date, author, purpose, claim and what it cannot tell us. No post-war treaty is evidence of what ministers knew before the outbreak.
Causal map — 25 minutes. Groups place their evidence on a shared timeline. Draw arrows only where they can explain a connection. Contrast the assassination as a trigger with longer-term nationalism, imperial competition and military planning. Ask which choices might have reduced or increased the chance of wider war and what evidence limits that judgement.
Plenary — 15 minutes. Pupils write a paragraph answering: “Why did the crisis of 1914 become a wider war?” Require one longer-term condition, two dated decisions and a sentence explaining why no single cause is enough.
Adaptation and follow-up
Support: provide a partially completed timeline and vocabulary cards. Extension: compare how two governments described the same event and ask whose interests each account served. For English as an additional language, introduce the vocabulary before source reading and allow a paired timeline explanation. As homework, pupils may choose one July Crisis decision and explain a plausible alternative, clearly labelled as a counterfactual rather than historical fact.
The timeline and source grid described here are activity formats to make in class; this page does not offer downloadable files. It combines the useful teaching ideas from two earlier Nexus Historia pages into one resource.
Sources and evidence
- National Army Museum: 1914 — To arms — concise chronology of the assassination, mobilisation and Britain's entry.
- National Army Museum: First World War — broader context for the conflict and its alliances.
- The National Archives: Loyalty and dissent — an example of an archive source pack and curriculum links; its documents concern wartime experiences rather than serving as a complete July Crisis pack.