Tenth Grade · History · week 14

A powder keg ignites: the causes of World War I

Identify militarism, alliances, imperialism, and nationalism (MAIN) as the underlying causes of World War I, and explain how the assassination of Archduke Franz Ferdinand triggered the war's outbreak.

Historians often remember World War I's underlying causes with the acronym MAIN. Militarism meant that major powers had built huge standing armies and competed in arms races -- Britain and Germany's naval race to build "dreadnought" battleships was the most visible example -- while military planners like Germany's had prepared detailed war plans (the Schlieffen Plan) assuming war was only a matter of time. Alliances split Europe into two armed camps: the Triple Alliance (Germany, Austria-Hungary, and Italy) faced the Triple Entente (France, Russia, and Britain). These alliances were meant to deter any single power from starting a war, but they guaranteed that once one country was drawn into a fight, its allies would be pulled in too.

Imperialism added colonial rivalry and resentment to the mix (recall weeks 10-13), while nationalism supplied both a general climate of competitive pride among great powers and, in the Balkans (week 9), an active, unresolved crisis. The spark came on June 28, 1914, in Sarajevo, Bosnia, when Gavrilo Princip, a Bosnian Serb nationalist connected to a secret society called the Black Hand, assassinated Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, along with his wife Sophie. Austria-Hungary issued Serbia a harsh ultimatum and declared war on July 28; within about a week, the alliance system pulled Russia, Germany, France, and Britain into the conflict one by one, turning a regional assassination into a continental war almost no individual government had actually wanted.

📋 For the teacher
Teach it (10–15 min):
  • Introduce the "spark versus underlying cause" distinction directly, and connect it to the same single-cause caution this course applies to every complex historical event.
  • Trace the alliance chain reaction on paper like a row of dominoes -- watching Austria-Hungary's declaration knock over four more countries in a week makes the mechanism concrete.
  • Discuss the dreadnought naval race as an early, very literal arms race, and ask what modern arms races might resemble it.
  • Ask what MAIN cause feels most avoidable in hindsight, and which feels hardest for any government to have prevented.
Talk about it:
  • Why might an alliance system built specifically to prevent war end up making a wider war more likely instead?
  • Why do historians resist explaining WWI with just one cause, the same way they resisted explaining Rome's fall or the French Revolution with just one cause?
  • Do you think World War I was inevitable once the alliance system and arms races were in place, or could a different response to the assassination have prevented it?

Mastery looks like: They can define each MAIN cause with a specific example and clearly distinguish the assassination as the spark from the deeper structural causes that made escalation possible.

Common stumbles: Treating the assassination of Franz Ferdinand as the sole cause of World War I, or listing the MAIN causes without being able to explain a concrete example of each.

Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
Records attendance + 15 min of History for this learner.
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