What did nationalism have to do imperialism and world war 1?

Nationalism played a crucial role in both Imperialism and World War I by fostering a sense of pride and competition among nations. As countries sought to expand their empires, nationalist sentiments drove them to assert dominance over territories, leading to conflicts and tensions. In the lead-up to World War I, nationalist fervor, particularly in the Balkans, contributed to rivalries and alliances, ultimately igniting the war following the assassination of Archduke Franz Ferdinand. Thus, nationalism fueled both the imperial ambitions and the alliances that precipitated the global conflict.