Answer: Nationalism in World War I
Step-by-step explanation:
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Nationalism played a significant role in the outbreak of World War I. Nationalism is a belief in the importance of a country or nation, and the desire for self-determination and autonomy. In the late 19th and early 20th centuries, many ethnic groups within the Austro-Hungarian and Ottoman empires began to demand their own nation-states. This desire for self-determination led to rising tensions between the different ethnic groups within these empires, and between them and the empires themselves.
At the same time, many European nations were becoming increasingly nationalistic, and saw themselves as superior to other nations. This led to a desire for expansion and a belief in the need to acquire more territory and resources. This desire for expansion and the belief in the inherent superiority of one's own nation ultimately led to the formation of alliances and the mobilization of armies, as nations sought to protect their own interests and assert their dominance.