Answer :
Nationalism was a significant contributor to the start of WWI. It refers to a belief that one's own nation is superior to others, and this mindset was prevalent throughout Europe at the time.
The desire for countries to assert their dominance and expand their territory resulted in aggressive competition and tensions between nations. For example, Germany's desire for "a place in the sun" led to their pursuit of colonies and territorial expansion, which threatened the interests of other European powers.
Furthermore, the assassination of Archduke Franz Ferdinand of Austria-Hungary by a Serbian nationalist sparked a chain of events that led to the outbreak of the war. Austria-Hungary's ultimatum to Serbia, backed by Germany, was seen as a challenge to Serbian sovereignty and sparked the involvement of Russia, France, and Britain.
Nationalism also played a significant role in the fervent support for the war effort. The idea of defending one's nation and its values was a powerful motivator for soldiers and civilians alike, leading to the mass mobilization of troops and resources.
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