Define Nationalism in 3 sentences

The belief that people should be loyal mainly to their nation, that is, to people with whom they share a culture and history rather than to a king or empire. Also, as a desire by a large group of people (such as people who share the same culture, history, language, etc.) to form a separate and independent nation of their own. Nationalism has the power to bring a country (collective of states) together, but can also cause separation/isolation/independence.

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b is the answer i am assuming