Definition of nationalism

identification with one's own nation and support for its interests, especially to the exclusion or detriment of the interests of other nations.

Explanation:

Nationalism is the identification with one's nation and support for its interests. Or the advocacy of, or support for the political independence of a nation or people. For example, nationalism is a way of thinking that says that some groups of humans, such as ethnic groups, should be free to rule themselves. 

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