Even severe Irish violence failed to revive nativism during the war.

Evidence

The fearful draft riots that rocked New York for four days in 1863 arose principally from the discontents of the city’s Irish working class. The convulsion was widely interpreted as a disloyal Irish conspiracy inspired by Confederate agents. Out of the horror that the rioting produced, came an effort to revive the Know-Nothing movement, but it passed swiftly and without consequence. … Altogether, the nativistic repercussions of the event were slight in comparison to the provocation. — John Higham, Strangers in the Land, 81

Categorization

• XREF: Evidence relevant to the reader’s question about whether threat-hardened anti-immigrant belief survives the removal of its organizing cause: here provocation was extreme yet nativism stayed dormant because the war provided an overriding external enemy.