Among nineteenth-century European political movements, the one most responsible for triggering World War I was

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Nationalism, the belief in the superiority of one's own nation and the desire for an independent nation-state, was a major factor in the tensions and conflicts leading up to World War I. Nationalistic movements and rivalries between nations, especially in the Balkans, played a significant role in the outbreak of the war.

Among Nineteenth-Century European Political Movements, the One Most Responsible for Triggering