nationalism (n) —
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 or supranational groups

Merriam-Webster Dictionary

According to the Merriam-Webster dictionary, nationalism has a number of near-synonyms, each of which carries its own distinct meaning. Patriotism is similar, insofar as it emphasizes strong feelings for one’s country, but it does not necessarily imply an attitude of superiority. Sectionalism resembles nationalism in its suggestion of a geopolitical group pursuing its self-interest, but the group in question is usually smaller than an entire nation. Jingoism closely resembles nationalism in suggesting feelings of cultural superiority, but unlike nationalism, it always implies military aggressiveness.