What was the main cause of World War I? | Kialo Edu

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What was the main cause of World War I?

Thesis 1, children below

A system of alliances that forced many countries into conflict with each other.
Thesis 2, children below

European nationalism, which created a desire for war across the continent.
Thesis 3, children below

European imperialism, which led to tension among nations attempting to build and protect their empires.
Thesis 4, children below

Militarization across Europe, which made war more likely.