The Know-Nothing Party became successful for a brief period because

Responses
A it opposed the United States' entry into World War I.it opposed the United States' entry into World War I.
B it was successful in two presidential campaigns in the 1840's.it was successful in two presidential campaigns in the 1840's.
C it attracted wide support among large numbers of German and Irish immigrants.it attracted wide support among large numbers of German and Irish immigrants.
D it opposed increased immigration and supported increased requirements for citizenship.

D it opposed increased immigration and supported increased requirements for citizenship.