During the 1840s and 1850s, which set of immigrant groups arrived in unprecedented numbers, resulting in a nativist backlash in popular culture?
A. Scots-Irish and Welsh
B. Dutch and French
C. Irish and German
D. Italians and Greeks
Answer: C
Explanation: Irish and German immigrants arrived in the United States in unprecedented numbers in the 1840s and 1850s. Their religious affiliations, cultural practices, and concentration in urban areas sparked a nativist backlash in American poplar culture.