How did nationalism contribute to work war 1?

Nationalism contributed to World War I by fostering intense national pride and rivalries among European nations, leading to heightened tensions and competition. Ethnic groups sought independence and self-determination, particularly in the Balkans, which created conflicts between empires. The assassination of Archduke Franz Ferdinand of Austria-Hungary by a nationalist from Serbia acted as a catalyst, triggering a series of alliances and mobilizations that escalated into a full-scale war. Thus, nationalism played a crucial role in both the causes and the dynamics of the conflict.