Jingoism
Etymology
The word comes from a British music-hall song of 1878, written to whip up support for war with Russia: "We don’t want to fight but by Jingo if we do..." "By Jingo" was already a mild minced oath of uncertain origin, used to avoid swearing "by Jesus." Supporters of the war were dubbed Jingoes, and their belligerent patriotism became jingoism.
noun · /JING-goh-iz-um/
Aggressive, boastful patriotism, especially a readiness to threaten or wage war against other countries.
What it names
It names the war fever that dresses itself as courage — public bravado that treats restraint as weakness and conflict as proof of national strength.
Example
The tabloids answered the border incident with pure jingoism, demanding retaliation before any facts were in.
Related idea
Patriotism is love of one’s country; jingoism is that love inflamed into hostility toward everyone else’s. The difference is not the affection but what it wants to do to outsiders.