1800-1900jingo(17-21 centuries) (probably from Jesus), used in the phrase by jingo as an exclamation in a 19th-century British song encouraging people to fight for their country
Examples
EXAMPLES FROM THE CORPUS
Many were religious authorities forced to take part in the movement by military men and were inhibited by the barracks-room jingoism.
Only the most narrow jingoism can allow us to deny this.
The War threatened to sweep away such fears in the uninhibited jingoism that greeted the outbreak of hostilities.
They deliver a newscast that lacks the jingoism of its many competitors.
a strong belief that your own country is better than others – used to show disapproval → nationalism: a mood of warlike jingoism—jingoistic /ˌdʒɪŋɡəʊˈɪstɪk◂ $ -ɡoʊ-/ adjective