How did the idea of nation states and nationalism influence desire for war during world war?

The idea of nation-states and nationalism significantly fueled the desire for war during World War I by promoting a sense of unity and identity among ethnic groups, often at the expense of others. Nationalist fervor led countries to pursue aggressive foreign policies to assert their power and prestige, as seen in the competition for colonies and military dominance. Additionally, the belief that one's nation was superior motivated many to view war as a legitimate means to achieve national goals, resulting in widespread support for military conflict. Ultimately, this intense nationalism created a volatile environment ripe for the outbreak of war.