>Nationalism is a political, social, and economic ideology and movement characterized by the promotion of the interests of a particular nation,[1] especially with the aim of gaining and maintaining the nation's sovereignty (self-governance) over its homeland.
>a sense of national consciousness exalting one nation above all others and placing primary emphasis on promotion of its culture and interests as opposed to those of other nations
Oh, that makes more sense. The first definition seems nearly self-evident; what nation state doesn't want to protect its own interest? But there's certainly a distinction in promoting oneself above others.
https://en.wikipedia.org/wiki/Nationalism